I think youtube ruined my relationship
Huh? How did YouTube ruin that?
I don't think it is necessary to point out. Just think about... money, fame, hot girls in their videos, the living in the US...
The only one to blame for your relationship being ruined is you, you shouldn't blame it on Youtube. If you're watching bad content on Youtube then you should cut it off.
I'm not going to do that.
It's really tough to look away on things that hurt you, but I believe it's still the best choice to just ignore what your friend is doing. The website isn't to blame, so how about putting up more effort in retaining your relationship, maybe you'll get to be in those videos too!