My FB wants to marry me

We've been fucking for like 4 months now and he's always kinda expressed that he wants more. But I can't. I'm not ready. But idk he's been there for me before and he's super sweet and the loving kine ya but he's also very sensitive which makes him violent sometimes (not towards me, but like material/tangible objects) and that only happened once. Anyway he's really trying to change for me, I didn't believe it at first but I noticed that even the way he talks to me and what he talks to me about is different. And last night out of nowhere he apologized for everything he's done in the past. Like really out of nowhere. So it got me thinking and idk... ☺️ I like him I'm just not ready to take it to another level. Ugh