What is wrong with me?!?!

I broke up with my boyfriend. I knew at the time I was still in love with him, but neither of us were happy, I told myself it was best in the long run. I went abroad for a moth, thought I was over him. I met a new guy 2 months later and we started going out. Things have got very serious very quickly, but it's fine, he feels liek the perfect fit :) Today I saw photo's/videos of my ex with his new girlfriend. All these stupid feelings have come flooding back. I'm not over him, I've realised. I'm not necessarily still in love with him, but I miss him like crazy, and I don't want to see him with anyone else. Part of me still wants to be with him Now I feel guilty, as I love my current boyfriend, but am questioning now whether I am on the rebound? I could see myself with the guy I'm with for a really long time, he is actually perfect for me, and if I was to do a pro's and con's list he would come out on top every time. So why do I still want my ex? It's like if I can't have him, no-one can! So right now, I've written a letter to my ex (he won't answer my calls or texts) including the necklace he gave me for my birthday. It says that I'm confused about my feelings, and want clarification that he's definitely moved on, because it will help give me some closure. He is giving off all the signals that he hasn't moved on properly yet, and what if something is salvageable? What do I do? and before you say it, I know I've bought this on myself.

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