I don't see him looking at videos of people specifically twerking as a red flag (just gross), I just see it is both of you not having talked about your boundaries.

it sounds like there is an issue with intimacy between both of you and your tensions are a very high as both of you are figuring out whether or not this relationship will work , as well as how to cohabitate . Every couple works out whether or not porn is acceptable.

You also learned an important detail, it's not just you, he is having issues himself.

It sounds like you are about ready to give in the towel and move back home, it sounds like you are regretting your decision and looking for a reason to call it quits (mothers phone situation).

Tldr: it's not good, but it's not a red flag either. It sounds like both of you need to talk to one another about the things that have been going on lately. Also, you shouldn't try to accept responsibility for everything that is going on as your fault, that isn't healthy, that isn't how problems get discussed, that isn't how problems get resolved. Both of you keep working on your communication and talk to one another.