A girl I had math with was walking home with me the first time, then my first girlfriend was someone I was friends with for a few years. The first worked out pretty well, but the second was a bit... messy at the end. She made the break up into a big deal and it wasn't good. (We both had boyfriends and they agreed that she and I could date on the side, then my boyfriend changed his mind 'cause it made him uncomfortable, and yeah...)