Not sure if he was an FP or not, I tend to have several at a time, but I definitely had a crush on him (I'm dating my FP but we're polyamorous and I was super ready to see if we could get a polycule going with this guy). I was told by a mutual buddy that he has a crush on me, and I trusted this person about it, because I saw no reason for them to lie to me. I originally suspected that the guy hates me, mind you. 
And anyway I attempted to invite him out or to my place several times and every time he said that suddenly a lot of stuff came up and he has to be busy with it all week. I should have seen that this was clearly a lie to avoid spending time with me, but I convinced myself that it's true and that my BPD is just being vigilant of people.

Fast forward to a week ago. We have talked about him joining my board game group before and he seemed enthusiastic about it. So a week ago I inquired when he has time, he answered, and I managed to plan the board game schedule in a way that accommodated everyone. After that, I sent everyone an invite to our group's server, as some people would have to connect online due to distance. Everything seemed fine. On game night, he suddenly admitted, in front of the whole group, that he doesn't actually want to be there with me and that it's a horrible mistake and that he thought that the invite was from the buddy who convinced me that he has a crush on me, an invite to HER group (she also has a group. I wanted to attend that one but she told me that she doesn't have a schedule yet and that she can't on Thursdays (I invited her to my group as well and our sessions are on Thursdays). Guess what. She has a schedule. It's on Thursday.) and that he wouldn't have joined had he known that this was my group, nor would he have agreed to join at all. Then he left the server.

It honestly left me really devastated. This all happened this Thursday and I'm still not over it. I feel like I must have done something incorrectly, like I wasn't cool enough or talented enough or attractive enough, and it's made me doubt that buddy too. I mean, I don't get it. It was HER who originally told me about her group and wanted me there, she invited me there, so why did she lie to me about not having a schedule and claiming that on Thursdays she's too busy at school? I don't get it at all. Had she told me, I could have joined her group just fine, I would have just had to move my shifts around, but it could have been done. I'm starting to think she may have lied about the guy having a crush on me as well, possibly with malicious intent.