I need help in understanding my ex's behavior. It's a long story but I need to give as much important details as possible.
In June I split up with my boyfriend. He had many problems and he pushed me away, became distant and didn't want my support. It was mutual decision to split up, he wanted to deal with his problems alone and said he doesn't feel ready for relationship. He also said that he feels he can't give me what I need and that when he "grows up" he will try to do everything to deserve me. So I let him go, I told myself that if he really loves me he will come back. Summer break had started and we went back to our hometowns.
After two weeks he wrote to me and we started talking, first like friends and than it became more intense. He managed to deal with most of his problems so he was feeling better. We started flirting, talking like when we were together. He admitted that he miss me very much and we even planned the date when we are going to meet. We wanted to get back together. Last week he went on a trip with some of our friends for a few days. He wrote to me right after he came back (as he promised). He was behaving normally, he was flirting, sending kisses and told me that he missed me. The next day I checked Facebook and I noticed that he changed status to "in relationship". Well, it wasn't about me. I was terribly shocked. I asked him about it and he said that his friend was there and now she is his girlfriend.
First he said that it was because I'm so far away (I invited him multiple times to visit me and I even went to the city where we study for a few days to meet with him but in the end he couldn't come). However that other girl also lives in "far away" town and she doesn't even study in this same city as us!
Than he added that she made him change his status because she changed her first (when we were together we were talking how we are opposing showing our personal life on fb and he agreed completely).
What is more he told everyone that he is with that girl after spending only 4 days with her, and after being with me for few months he didn't want to show it or talk about it to anybody (only his brother and roommates known about us). I feel like he was ashamed of our relationship (I'm really not a girl which someone should be ashamed of) or maybe he didn't treat it seriously.
And finally he said that relationship with this girl want last anyway and when he will finish with her we can start dating again. No way!
I told him how I feel about it, but my answer wasn't harsh (I think I was to shocked) and in the end he said he want to be friends. But he hasn't written a word since our last talk. I know that maybe I should be grateful that he hasn't and I'm done with him but now I'm feeling even worse. I think he threw me away like old toy he doesn't need anymore.
I just want to know why he did it? Why he behave like this? I need some clues. It's like he has multiple personalities or something. When we split up before summer break he behaved so mature and sympathetic and now he did something like this in a worst possible way.