Why the hell do I still think about him?

Ok, so I used to date this guy named jovanni. Geo for short. It was probably the best relationship I've ever been in. He was sweet, funny, caring all that good stuff. So one day he dumped me. Omg I was crying so hard. Then about three hours later he texted me saying "you know what, do you want to get back together?!?" and me being a caught up in the moment that he actually wanted me back I said yes. Well, that lasted for like two days. See, geo moved out of our school so we were only dating til one of us got asked out or started liking someone else. So then he told me that he started liking this chick named lina. So he dumped me. For real. I don't think I've ever cried so hard in my life. So I thought he was going to that Lina chick but no. He went to my BEST FRIEND he asked her out and she said yes. Well obviously I still liked him an he knew it. So every little cute thing he or she did, he told me about it. Why? I have no idea. So then my friend (Melanie) broke down and dumped him. Me being a good person asked if he was ok and he thought I was being a smart ass so he was "getting revenge" by telling me all about Lina and this other chick Emily. Yeah, total douche. But here's my problem I can't stop thinking about him. At all. Like I miss him but I don't miss him. We don't even talk just to have a conversation. I'm always thinking about him when I know I shouldn't. I miss him I guess. Not a lot but to the point where I'm constantly thinking about him. I need help. I should go to a therapist or something. But do t they tell the parents what you tell them? Hm I couldnt do that. I don't know why the hell I think about hom. I think it's cuz he was so sweet and did all these cute things that I kind I long for it I guess. I still have the voice message he sent saying I love you, I still have the pictures of him he sent me. I still miss him.