My husband showed the exact same reaction which strikes me as curious. What I saw was a woman who had become embittered over the years by the lack of communication and with no access to Paul's sanctuary (=his practice). She had been shut out for years & let herself become some sort of victim. She feels justified to cheat on him and even escape the marriage for a whole week, leaving not only Paul but also her children to fend for themselves. Being the adulteress in this relationship, this was the easiest way out for her to cope with her guilty feelings. But clearly in between there were some tiny signs of remorse and she tried to reach out to Paul. To me it seemed he was refusing these attempts, sealing the miserable end of their marriage. In couple's therapy she clearly came off as self-righteous, not putting herself in Paul's shoes and playing the offended one. But it was a sad way to learn of his feelings, he should've shared that with her sooner. Although my husband points out he didn't come to terms with his feelings for Laura until shortly before that shared session with Gina. Which rich, complex characters, with flaws and good sides and all. I found both people portrayed very realistically.

I've only finished the first season. I think she's a decent woman trying to deal with someone who refuses to open up. She made some mistakes, but she's actively seeking resolution and Paul is just not at all helpful. He should have cancelled or postponed sessions and spent a lot of time with his wife, talk to her and fix the problems. Then deal with the kids. Instead he ignores her then attacks her.
Maybe in later seasons she gets worse, I dont know.

And don't forget how sweet Kate was to Sophie when Sophie needed help changing her clothes.
So? Who would refuse to help a disabled girl change her clothes if she's the only woman present? Why is this action considered so remarkable?

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How dare you speak that way about Admiral Cain! None of you are fit to polish her boots!
Seriously though I had a lot of sympathy for Kate. You could see what an arse hole Paul would have been to live with by the way he behaved in his sessions with Gina. I couldn't understand why Gina put up with him until it came out in season 3 that the book she was writing had a deeply flawed character who had an uncanny resemblance to Paul in it. LOL!
When we see Kate being all bitter you have to realize that her marriage to Paul had been over for years and we are seeing the final disintegration of it.
And don't forget how sweet Kate was to Sophie when Sophie needed help changing her clothes. "You could learn a lot about how to talk to people from your wife Paul" was what Sophie told Paul afterwards. And I think it was a highly observant, and when you consider it in terms of what it says about the type of individuals Paul and Kate are, also a highly revealing thing for Sophie to say.
The players of The Game are the scum of the earth

Not quite for the reasons other people have mentioned.
She doesn't seem to have much in common with Paul. I would expect Paul to be married to someone like Gina. Not necessarily another therapist, but with empathy for his profession and a match for his intellect.
The scene where she is taking out the trash (and runs into Laura leaving her session) underlines her commonness. If she were an Ivy League wife they would have shown her gardening instead.
As played by the actress she comes across as petty, snippy, insecure, and jealous, but those are the lines she is given. She does have street smarts, recognized right away that Laura was the kind of woman who wears stilettos in the morning and expects to get whatever man she sets her eyes on.

I find her extremely cold. Can't understand why anyone would want to date her. Maybe she is supposed to seem like that.

Wow, I totally agree with your acessment. She is the one screwing another man, and she is even telling him she is going off for a week to screw. Granted he has feelings for another woman, BUT this does not excuse her letting another man go balls deep in her. No way would I want her back, and I would not want to work it out. Paul is WEAK, and he let them, the two women, gloss over his wives crap, and blame everything on Him. Its like so what she was screwing another man, and all that goes with itBJ's, ect But your a bad husband, so what she did is not as bad as you having feeling for a patient. These are the only segments I wanted to skip, the ones with Paul and Gina. BTW, my favorite is Sophie, the Laura.
Other than the weak Paul stuff, this is a great show. At least season one.

FOR SURE! That f-ing bitch! She comes home every week with some guys cum in her and he still wants to take her back. No way would I ever take a women back who screwed around on me! Damn I hated that bitch.

Hated her more as I re-watched the show. We don't know what she was like before the show, but from what I saw - especially while they had couples sessions with Gina - I wish Alex would've taken her with him for a nice ride-along flight in his plane.
That's not to say that I was a big fan of Paul's personality or flaws

Annoying as hell. And she pulled the most annoying facial expressions. Especially with her mouth.
It's an ordinary high school day. Except that it's not.

And who for a minute thought she would really end up with someone like the saintly Steve, a rich, artistic, terrific guy who eagerly takes on a woman with three kids (because, yes, they had 3 kids in Season 1, an older boy away at college, though he seems to have disappeared in Season 3).

Ye, I found her very hysterical, the only parts in S1 I wanted to skip or shut my ears because she was screaming so bloody loud! I don't know, if this is a portrayal of a real person, than it seems she is the only character, who was in real need of therapy ..

The dynamic here and in real life for people is more complex. We see is season 3 how messed up Paul is, so what was his wife supposed to do?
It's almost like you see Gabriel Byrne as Gabriel Byrne and assume he is a perfect Hollywood actor so he is perfect and his wife is awful such a simplistic superficial viewpoint. You get a good opportunity in this movie to watch and try to take in what is going on, the whole thing, both sides or everything.
Season 3 shows Paul's inner demons, and he is not great shakes either. Nor is he able to get past his limitations despite his expertise in human relationships .. I think this is one of the major themes in the show, and that is why I love it so much.

She played the horrible vampire on "True Blood", season 2. But she got her comeuppance in the end.