I have. It was kind of weird, actually, since it was my first time actually asking a guy out.
We were good friends for a while throughout the school year. The only reason we became friends was because I was the leader type and he was the follower type and we were put on a team together with two other people. I definitely had a thing for the guy, so naturally, I flirted. I even went so far as to dress nicer to get his attention (which it did). He kindly accepted most of my advances, and even let me easily bribe him into giving me a kiss on the cheek. So far that I knew, he was single. I tried to confirm it with every source available, and I was pretty sure all the lights were green.
The summer was coming so I encouraged myself over a few weeks or so to just ask him out since he didn't seem like the type to confront someone about something like that easily. Neither was I, but I decided it would be rather endearing if I did it. I attempted it in between class, but I wimped out. Instead, I ended up convincing myself to call him later that day and fess up. I did so, and there was an awkward silence and some stuttering. He had to ask me if I was actually asking him to "date me", and when I said yes, he pulled this story out of nowhere that he has a girlfriend in Texas. Instead of moaping about it, I said "okay!" kind of cheerily and hung up. He texted me that we could still be friends, and I was a little irritated because I had the belief that he made that up to get rid of me. Either way, he found a girlfriend closer to home recently.
Once the summer came we stopped talking, so I guess I got kicked below the "friend zone".