Only kinda tragic

So yeah, I summed up the courage to ask out this guy from my trig class, and surprisingly he said yes. I didn't really know how to really start the relationship so we spent the afternoon at the "arcade" (a strip of restaurants downtown) and I had a really good time but i could tell something wasn't going right. Literally three days after some more awkward confrontations he said it wasn't working out and left me for a girl. This was super weird because he clearly said he was strictly gay on multiple occasions. I don't know if I was the problem but I just needed a place to vent.