I suspect he's gay. If his family is at all observant, they have been trying to find him a nice Jewish girl. He was probably tired of awkward first dates with attractive girls his age who want families, so he found a beard who is too fat for normal sex anyway. I'm sure she IS really into him and it is kind of mean to use her. She will probably never understand that his personal trainer is not just his personal trainer, or that his headaches when she's horny aren't really headaches. Ignorance is bliss sometimes though.