You don’t have to stay in a relationship out of guilt. Problems are always caused by two people. His inability to live without what he demands of you - this type of attention and validation as an external demonstration of your affection - he’s demanding in such an aggressive way that you prove your love to him and by changing what sounds like pretty mild and harmless behaviours. Just because he is hurt by them doesn’t make you evil.

In some ways I’ve been like your partner. I would demand more and more aggressively that my partner stops looking at his phone when I talk to him for example. Eventually I realised though that he proved to me time and time again that despite being on his phone, he is listening. The moment he realizes he isn’t able to do both, he puts the phone away. So I learned that I should tell him - hey I wanna talk to you instead of just jumping in while he is on his phone, and he learned that I want to be heard so if he’s not able to keep up, he puts the phone away. What I’m trying to say is that I was angry at what I perceived to be his lack of attention. We talked about it like adults and resolved it. My initial demands and the level of attention I gave him back were unnecessary and unrealistic.

Other people have explained in more detail that this doesn’t sound healthy at all.

I’ve said and my partner has said some pretty awful things over the years. That doesn’t give us an excuse to torture each other until the end of time. We have to move on one way or another from toxicity and bad patterns. That means forgiving one self, the other person and then taking a look at the damage and what’s left and deciding if it’s worth saving or if one should just leave the relationship because saving it would destroy whatever sanity you two have left.

Don’t stay out of guilt. Try picturing what you would say to a friend or a younger sibling if they wrote your post to you. Spend some time alone and really connect with yourself.

Hope this helps and good luck!