I was in a 5 year long relationship with my ex. We met when I was really young (17) and he was in his 20s. I was the shy introvert type when we met and I was never really exposed to party/sexual stuff when I was younger. I would say I was pretty naive, had my head in books most of the time. When we met I thought the world of him, but after years of being with him I find out he's probably the most disgusting individual I personally know. He had cheated on me constantly over the years, and somewhere down the line 2 or 3 years into it something happened within my head and I just kind of went mental and the thought of him cheating is what started to turn me on. From there on it developed to me seeing the world through his eyes, so things that were normally disgusting to me or I didn't care about then started turning me on instead. For example he's into bigger breasts in women and I started doing getting turned on by that. Or whatever porn and sexual acts he'd describe over text with these other women, would start turning me on. Like deep down inside it was killing me and I felt like crying my lungs out but on the other hand it would make me feel aroused. Soon enough for around 2 years I started masturbating excessively. Like my partner and I were long distance at the time and we'd sext and I alone needed to get off like 4 times a day to the point where I'd become sore but I needed to do it. Around some time last year it stopped but now that we have been in the same country this year and more recently I have found proof of newer relationships he's been having that aren't just random hook ups but proper relationships, they've even been exchanging texts and him missing her whilst I was there silently crying myself to sleep. I don't want to be like this though, it is ****ed up. I want to get away from all that and feel free from him. And even though he has left me I don't feel free. I get overcome with these feelings of lust over things that I find disgusting and I want to stop! Help me. What is wrong with me? Is this a syndrome?