my boyfriend and I went to the same school, and were both Greek, but didn't start dating until long after college.... I was actually dating one of his brothers for quite a while!
It's a constant source of suprise to me though - while he was a Chapter founder (Pi Kappa Alpha - Kappa Omega chapter!), he's been out for a few years longer than I have, so I think he's a little shocked by how often I still talk about my sisters