<human>: Can you condense the text into a few key points?

I'll try to keep this short...

We had been dating for the past 2.5 years, and several times he had broken up with me due to thinking his career path(and I guess the lifestyle of Opera singers as well) wouldn't mesh with mine(psych major- have no specific plans for the future). Throughout the beginning of our relationship he did a lot of things to make me feel insecure about myself and thus I felt he needed to earn my trust back. If we ever fought, he would not say anything back to me but agree about what I thought he had messed up on. EX:"How come you're not that romantic...?" "I know, you're right, I'm sorry." (stupid example, sorry) Two weeks ago, he woke up and broke up with me after denying me sex. He told me that he didn't exactly know why he's breaking up with me, he just knows that he wants to be alone and "start fresh". We had been planning to sign a lease to an apartment in a couple days, we(or I guess I) thought we were gonna have a long future ahead of us.

How do I come to terms with this? I feel it is just extremely unexpected seeing as he had never complained or gave hints that he was unhappy before, just simply insecure about whether our career paths would work together. (I thought that was silly, since I didn't have a specific path.)

He says that there is no chance of us getting back together what so ever, and I'm just confused on how we got to this point. Now that I know we can never get back together, how do I move on from this? Unfortunately I lost many of my friends from a overly controlled relationship and just feel lost and alone right now. I'm constantly looking at his social medias, I don't know, trying to find out why this happened because I don't understand his reasons.

I know many of you will think this is ridiculous and stupid. But please, just help me out here.
<bot>: How do I move on from someone that I thought I was going to spend the rest of my life with, after a sudden and unexpected break up?