Why is my ex acting like a jerk?

blakexoxo
Me and my bf of 7 months had an on-again, off-again relationship. Recently we had a big fight, which led to him breaking up. Said fight is about a month ago now. We didn't talk to each other anymore other than texting sometimes, but basically I was the one to initiate contact usually. He always insisted on needing his time, so finally, I just ignored him. Last week I saw him at the local cafe I work at. We are in the same group of friends and so it just happened that another guy friend of mine was there too. For my break I went out to sit with them, ignoring my ex. Later in the evening, after he was gone and I was done with work, I got a text from him saying something like "are we never gonna talk to each other again". The sad ex girlfriend I was, I simply poured out my feelings saying I couldn't behave normal towards him as long as I loved and had feelings for him. I asked him if he still had feelings left for me, he said yes indeed he had feelings for me still and so I asked him if he wanted to talk again. He said yes. The day after that I asked when he wanted to talk and he said sometime next week. So this week on Monday I asked him when we were gonna talk. All of a sudden he said it would be a better idea to not talk anymore. Of course I couldn't accept that... I begged for him to talk to me and he started being very rude, and only mentioning the bad things about me and our relationship. Also, when my best friend (whom he is also friends with) told him I was gonna be somewhere when meeting our friends, his response was "I'm gonna ignore her perfectly", while knowing that my best friend would show the text to me. What am I supposed to think? Or do? I really want him back so please don't give me any advice on how to forget him. Why did he change his mind all of a sudden and how do I get him back and to talk to me again, even if it's not about what went wrong in the relationship?
Thank you
Why is my ex acting like a jerk?
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