Getting back with my Ex...

So after getting out of a toxic relationship my ex started messaging me again and I thought nothing of it because we had been friends even though we broke off our relationship 3-4 years ago. As we were talking he started more interest and started calling me “baby girl” and “baby mama” I don’t ever know how to react to someone who’s calling me that, other then someone I’m in a relationship with. We started hanging out and meeting up but he would act very flirty. He would put his arms around me, picked me up, say he was going to kiss me, and well liked to tickle me..? I had feelings for him for awhile and he was the one ex I almost could never get over but now I only love him as a friend but somehow as a relationship too. We were on FaceTime and he said I was his and only his and that no other guy can have me. I guess that was his way of asking me out. He is two years older then me and so he’s 16 where as I’m 14. After one day of dating he asked me to come over to watch movies, I said yes sure. When I went over he immediately asked me if I wanted to come lay down because I was tired and I said yes. He told me to take off my shoes so I did as he said. One hour passed and we were just laying together with his arm around me and kissing every now and then. At one moment he wouldn’t stop kissing me and started getting on top. He had expected me to like it but I didn’t and asked him to stop, when he didn’t and instead put me on top it was my chance to get off and tell him to watch the movie. He started rubbing my leg and said that’s mine and ur mine as if I was a object. I took hi hand off me and sat there uncomfortable while he thought I was mad. He kept moving closer and touching me so I moved to the couch off the bed and he went on top of me then picked me up and threw me on the bed. At that point I was scared and didn’t know what to do because I am small and weak compared to him. I didn’t see him to be aggressive but I guess the years change people. He started pushing his dick up against me and mistaken my hurtful wince as a moan but no I didn’t like it. He started touching me on my lower body and repeatedly asked me if I wanted him to take it off and I said no. He said over and over “Come On” and I just said I wanna go, and well he said babe stay why come here... I put on my shoes and jacket and tried leaving but he blocked the door. He asked why my heart was beating fast and I said because I’m tired and wanna get home before I get in any trouble. He wouldn’t unlock the two doors so I was stuck trying to kiss the guy who just did that to me so I could escape and breath. He is very jealous and was already going through my phone and giving me his passwords... I’m not gonna lie I was scared and still don’t know how to break up with a guy who used to be sooo sweet and who I loved as a friend. Help.?