He did say, that he didn't want me to waste my time, and that the wasn't sure about our relationship. And he has confessed that he emotionally cheated during our LDR. We've talked. But what i dont understand is, why he treats me like no one. I did try to move on, went on dating apps, did some hook ups. But all felt empty. I saw the guy I cared for everyday, and he barely blinks an eye on me anymore.
Basically, he has set the tone of the relationship he wants to have with you, which is distant and neutral, the way one would behave with a colleague or work mate that one has little in friendhship with except for workplace interaction.
I would suggest that instead of investing any more time and emotion in this situation, you treat him in exactly the same neutral manner that he is treating you with. Be polite and distant, and focus on just the job at hand. Sometimes this hard effort - even when its fake - allows us to have the space and time we need to recover from being hurt. And at the end, you will be free of him.
Chances are good, though, that once you distance yourself and he no longer feels pressured, he will become friendlier.