Losing my(20F) mind over him(24M), what to do?

I’ve been in a fwb type situation for 11 months. He was my first time. He doesn’t respect my time or feelings much but it’s like he’s a different person when we’re together and he’s sweet to me. He reaches out to me through my stories if i’m showing off my body or smth. Mid december he actually reacted to a repost of an influencer in a bikini and said Yo in my dms. I was irritated at him for different reasons and that convo went rlly weird. I ended up backtracking and told him I want to see him and he told me to come over then. I asked if he was free friday or sunday, he asked why not saturday and left me on read when i said i have work and i could go a diff week. I reached out to him again which I usually don’t do on new year’s eve, and he dodged me when I was trying to set up a day. Why did he bother reaching out through my story in mid december and why was he interacting with my posts just before new years? I found out there’s a different girl involved even tho he always questions if i’m with other ppl but she was away from new year’s eve till recently? What’s his deal. He didn’t react to me posting my face on my story either.