I usually like Rose advice. But that is so immature to do. To make up excuses to do less and then just let it fizzle out. That's almost as bad as starting to act so badly that the significant other will dump you.

They already have been bad in communicating. Your first reason for breaking up makes no sense to me. He hasn't brought up marriage. Have you? Maybe you are a very traditional person where the male has to kneel down with a ring and propose. I just don't like the concept where the female waits sheepishly for the male to propose in dramatic fashion. It's 2016. I don't know how you can bring up marriage, and it ends in a fight, and you stay together after that. That's so odd to me.

There's all these things you are fed up with and annoyed by. They are good reasons for breakup.

Since the way you tell the story, he knows exactly what you are dissatisfied about and he can't or won't be the person you think you want, you can just say: "I want to talk." and explain it is over and he should know why. You don't live together so there's no difficulty there. You just stop seeing one another completely after that talk. If there is still something to resolve, you can meet one another one more time. Then no contact.

I don't know why you would want to draw this out and get a lot of additional drama.

I also don't understand your 'I don't know how to break up'. You don't know how to break up? Or you are just too afraid to tell him? If so, why? Or you are too afraid to actually suffer through the breaking up?