I (23F) am confused about what (24M) intentions are?

So I (23F) thought it’d be common sense to not share certain things to other people, especially to people you barely know irl. I guess that didn’t go through this guys (24M) head. He has no sense of privacy and you can’t trust him with anything you say online otherwise he’ll babble it to other people in person. Our friendship is complicated, well really, I wouldn’t even call him a friend. Ever since he hooked up with my friend, things started going downhill. Posting pictures of his hook up without my friend knowing? No body needs to know or see. He proceeded to say, might I quote: “Call me the rizzler.” Mind you, this is a 24 year old (man child) using this jargon of speech. What’s even worse is that I had to ask someone else to talk to him about his behaviour. A sign of lacking social awareness and social cues. He would also make inappropriate comments or ask me sexual questions about my boyfriend, which was odd and weird. That’s not your business anyways. I told my boyfriend right away and he said that guy might still have feelings for me. But I don’t think that’s the case…(we had a thing years ago, that was it). Another thing I find really weird is how badly he (24M) wanted to meet my boyfriend to ease his mind. I immediately declined it, saying that wouldn’t be necessary and it doesn’t make any sense. I did leave the server and remove him (24M) off my friend list. I’m really confused as to why he’s (24M) is acting like that.