I (22F) have been with my bf (22M almost 23) for almost three years now and I'm very sad about how our relationship has evolved. In the beginning, he was very sweet and soft, but over time, it's like he got too comfortable with me. It got worse this summer and recently, it keeps going downhill. He's always been pretty immature and rude towards his sister, but now, he's doing it to me too. He says and does things purely just to annoy or upset me because it amuses him to see me react like that. For instance, he likes to put his fingers on my face or gently tap my cheeks or my head. I don't like it and I told him many times. At first, he said he understood and he apologized. But now, he's doing it again. When I told him about it, he blew up, saying that boundaries shouldn't exist in a relationship and that he could do whatever he wanted to me and I could do the same to him because we're dating (obviously, that doesn't apply to anything violent or anything like that, just ''minor'' things like that). He told me I was overreacting and that I was immature about being upset about him annoying me once again. I couldn't believe my ears.

It's also worth noting that a couple of weeks ago, his mom told him in front of me that he should change his behavior towards his sister and me because I would get sick of it and end up leaving him.

I'm so sad about making this post because I do love him, but I feel like I'm constantly walking on eggshells and I need some outside opinion. This is my first relationship and I don't know how to navigate the situation. What are your thoughts? Thanks in advance.

EDIT : Age in text.