UPDATE:

Hi everyone. I just wanted to update you all, because your answers have helped me a lot.
Well, at first I was still like, hey, we should work it out somehow, there’s good stuff there, etc. I felt like I should still give us a chance. I know.
A few days before Christmas we had a meeting with my friends, where he half-shouted at me in front of them that I have no business telling him my opinion about something, because I obviously have no idea about it. I was so embarassed… later my friends told me that they were mortified by this.
Also, a few days ago, we were preparing to drive from our birth city to my city. We had a misunderstanding about the exact time when we would leave and when he arrived at my parents’ place, I was still out with a girlfriend. My mom called me stressed out to go home as soon as I can bc bf is there, then 2 minutes later she called me again – this time he took the phone from her hand and said: Fucking Ingrid, fucking Ingrid (my friend), how could you not be at home when I came here, etc etc… My sister told me later that he yelled quite a lot in front of my parents and her and even my parents were super mortified and angry at him, even if they liked him quite a lot.

Well… Maybe I could have acted earlier. Your comments were all true, and reading through them from time to time made me realise that this was not a good relationship. I kind of didn’t want to give it up, idk… But all of this, combined with the fact that I hadn’t been enthusiastic for a while, and the fact that our sex life was also suffering… Well it’s over. It’s weird now, of course there are things that were good.
But I hope that I can say in my next relationship that I wouldn’t have thought that it could be so good.

Wow. That guy’s behavior in front of your parents is absolutely inexcusable. What an ass. Thank goodness you didn’t move to be with him. Now you know to trust your gut next time. You had doubts for a reason.