B/f being rude

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Yesterday we had a family get together for Em's b-day.  My Dad came down w/ his girlfriend and Mom came too. (My parents have been divorced for over 30 years)  They get along great.  So we were all talking and stuff, and I dragged Keith out of the bedroom(b/f) and he goes to the computer.  Doesnt join in but he is there.  I dont know if he has a grudge against my dad or if its the claustrophobic he gets when there are alot of people around.  He gets along great with mom  but i dont think he ever said two words to my dad.    Maybe he just doesnt like him cause dad left mom all those years ago. I dont know.  If i ask keith, he'll probably say its the claustrophobic thing.  who knows.  I just want everyone to get along! lol