This sounds like it was a bad match for you and you are better off without them.
In my opinion, the criteria for a successful relationship is one that encourages growth. It should provides a safe space where differences, changes and mistakes are accepted without judgement. Above all, you feel loved and supported. From your limited description it does not sound like he provided any of that.
I think I’m just meant to be single.
You are 20. You are likely still discovering the type of person you are and developing the strength and tools to be that person in the face of adversity. I think that you should enjoy being single and focus on you, not some “us”.
Love who you are, build a strong and healthy relationship with yourself, and realize that you deserve somebody who will honor and respect all of you not just the bits that are convenient for them.