Did I mess up the relationship?

Ok, so I’ve been dating this guy for about a month now. It’s been great and he has taken me out to some fun places (bars, arcade, etc..). We even went to the gym together once. He pays for everything, even if I insisted to pay. He’s sweet and did things like cooking me breakfast in the morning, letting me sleep in while he went to work, kisses on the check/forehead, picking me up for our dates, sent me text like how’s ur day, good morning and good night, etc, teaching me to play a song on the piano (we both loved playing piano).

Then I noticed things started to go down hill one night we hung out. He got mad about something he was trying to do so we could watch a movie together, but we went to bed early that night, and insisted that his roommate drives him crazy and doesn’t like him living there. We can’t do anything when he is around. Anyway, he didn’t want to talk about it and we didn’t end up having sex or anything that night. I could tell he was upset. So from there we would still hang out, but he started to cancel on me a few times or made up excuses more when I wanted to hang out. He also text me less.

So my birthday just came around and he didn’t wish me a happy birthday, even when I reminded him and sent him a text. We also talked about doing something for my birthday. So I went out with a friend instead and he came up with an excuse about helping his mother with something. So the next morning I broke up with him and he was quick to agree to break up. I went to pick up my things. I shot him one last text explaining that I had a lot of fun with him and that I thought he disrespected me and my time, hoping that he would say something back, but didn’t.

I don’t understand because he was going to take me for a ride on his motorcycle and we had a lot of plans for the summer. I don’t understand what went wrong …. Did I mess up? I really miss him. We still follow each other on social media. What should I do?
Did I mess up the relationship?
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