My boyfriend (only one I've had) was a part of the group of friends I'd started making when I started college. We were vaguely friendly but nothing beyond that (I didn't even think of him that way as I liked someone else in our group and he had a girlfriend in a different town).

A few months later, we were at a party and he'd just broken up with his girlfriend and was upset, so I talked with him about it for a bit. From then on I started considering him as an actual friend, and a few weeks later a mutual friend found out and told me that he had a crush on me, which was a total shock to me, lol.

After that, he started outright flirting with me more, and after thinking about it, I realized he was pretty damn awesome (and a way better match than the guy who I thought I liked, who is incidentally still a good friend). We saw each other pretty much every day that month because of social/school activities, and eventually he asked me out and now we've been together 7.5 years.