Am I reading too much into this??

Ok so I became really good friends with someone who would later become a best friend..Anyways, one day he tells me he's bi. The following weeks, he Snapchats me a ton. Asking me about how my day has been, constant "whats up" and complimenting my looks. There was a huge shift in the way he talked to me, sending me really good selfies with filters.Then suddenly, after two weeks, he pivots. Saying he's sure I'll find a great guy, and that he's been dating someone for two months. And the way he talked shifted back.When I ask him, hey what the heck? Were you leading me on when you were already dating?? He denies it, saying he was just being friendly the entire time.And on top of everything, his sister told me he liked me two weeks ago. And that's when the shift happened. Part of me says, hey maybe I'm being unreasonable. But another part of me thinks he doesn't want to admit he wasn't 100% faithful to his bf.My main concern is I'm connecting thoughts that aren't there. I'm doing a self check to make sure I'm not that hoe who thinks everyone is flirting with them hahaThoughts?