Hi, me! Going through the same thing with the ex. I didn't want to be in a relationship and he pressured me into it. I (said he was the best thing to happen to me, I would never find someone like him). I kept telling him, "I'm in a transition period, I can't be in a relationship, I'm not ready blah blah." But no, I was going to be the mother of his child - even though we had to be LD. He singlehandedly convinced me, made promises like he was going to move to me, talked to me about our future all the time. Eventually I opened up to him and also let my guard down. I fell deeply and hopelessly in love with him. I became immensely attached. In July, he even found his perfect dream house near the medical school I was going to start. He was about to put a down-payment on the house. I didn't believe he was going to be move but he promised to no end. He even guilted me for thinking "this won't work," and said I was beginning pessimistic.

Fast-forward beginning of September, he said he was lying about his feelings the entire time. He never had intentions of moving to be with me. He just didn't want to hurt my feelings. To matters worse, he apparently had time to let me go which is why he wasn't upset. He also thought he was doing me a favor, which is why he never felt bad. In his own words, he only felt pity for me in lieu of guilt or remorse. Now I believe he's dating some chick. I haven't spoken to him for four months.

The bottom line is, people are horrible. I am still angry and resentful. I understand where you are coming from, OP. My best friend gives me shit about it and says he didn't fuck anything up, so its time to let go of the anger. But I can't. He is a genuine monster, sociopath, and piece of shit. I hate him more than anything. However, this quote gives me solace:

"People pay for what they do, and still more for what they have allowed themselves to become. And they pay for it very simply; by the lives they lead.”

Good luck OP, I'm with you on this.