Do you mean the actress that played the mail order bride?
Raab probably just grew up and didn't want to to be the butt of all the jokes.
They've talked when they ran into each other at a party. At least that is what was said on the radio show.

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If they really had that big a fight that they aren't talking anymore, I wonder what it was about.
Did Raab sleep with Bam's wife, Missy, or something? lol

when did he disappear? I am half way through the last season and he's still around in the show. Where else would you miss him?

I heard he wanted to go to college.
And I also heard that him and Bam had a major fight. I don't think he was even at Bam's wedding.
I loved Raab!