I recommend you take a look in the Life Stories and Blogs sections, a lot of those start with people's starting stories.
Short version of mine: I was with First BoyFriend (FB) in a mono relationship (well, til it ended) for about two years. He became friends with Current BoyFriend (CB) and the three of us were friends. Broke up with FB, eventually started dating CB, and the three of us were friends. Six years later, broke up with CB, didn't break up 'clean', sort of got back together, then FB fessed up that he missed me. CB has always joked about not caring if I had sex with FB, so I asked him if he meant it. He said yes, and here I am the hinge of a vee. It's only been a few months, but feels like eight years.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who lives in the apartment building next door)