Should I move on?

I was with this guy for 7 months. Not in a relationship but we were pretty close for an FWB. I'm 16. He is turning 18. I felt like he was catching feelings. But I broke it off because I was done with the way he would talk to other girls and have sex with them but he gets mad and jealous when I talk to other guys. It felt like a relationship to me. I'd sneak him into the house and let him sleep over and stuff. I thought we were going to end up being together but apparently not. He tried contacting me multiple times. I kept telling him I don't want him anymore. But when my friend saw him at a party all over this other girl. It hit me that I still want him. Is it too late? Or is he trying to make me jealous? I have been thinking about him nonstop. 

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