Has anyone ever had a boyfriend who was in a fraternity?

i have an ex who is in a fraternity (we just broke up because of the frat and hes not spending time with me anymore, but we were dating BEFORE he was in a frat) and now he's totally changed and the whole frat is ruling his life and when i tell him about it, he just CANT SEE IT! how do i deal with that and when will he ever see that he's changed?