What should I do please help with my so called boy friend?

Hello, Please help me, I am so depressed with myself and my life, I was in a realtioship for 2 years with this guy. I never liked him at the beginning, I used to be so rude to him, I used to tell him I dont like you go away from my life, but he wouldn’t leave me alon. We draged our so called relationship for almost 18 months, then all the sudden he totally changed, He wont pick my calls, very rude to me, Wont text me, Wont see me, That guy use to do anything to see me everything he would walk to my place 3 am in morning, I am not lieing guys, I dont know what happened to him all the sudden, He is different person now. He never had driving license, I helped him in everyway I could even thu I use to be so rude to him. Then he bought a car and I think thats why he is totally change . His friends wont hang out with wont talk to him because he didnt have a car and now he does eveyone is after him. After he left him without even giving me reason, he would just say he is not a good person for me. Okkk why it took you 18 months to understand that? When I was telling him that I dont like him he wont leave me alon. Now he is saying all this crap. Now he keeps coming back after months and then make out be all physical with me and then disappear for 1 month.

He did this 5 times already, dont know what to do, I luv this guy so much, I know I treated him bad but I realized it now and I did say sorry to him many times but now he is treating me even worse.

I dont know whats on his mind he wont say nothing to me. He wants see me once in a while make out with me have sex and totally ignore me for month.

Please guys help I know I been stupid many times I just dont know what to do anymore I can think of anything Please please please help me Please

Thank you .