Arguing

How much arguing is too much in a relationship?? It's not every day but it's like every week there is a new issue. It's not stupid little things like what we're going to do it's big things like him being selfish or acting different in front of his friends or finances. He says that I'm the one he wants to be with and the one he wants to marry and he wants to have children with me but I don't see that through this actions. What do I do? And yes I have tried talking to him about it and he apologizes and says he's going to work on it. And he's gotten better about a few things that we have talked about before.and I've changed things for him when he has asked (he's never asked anything unreasonable) but I don't know what to do anymore. I feel like this is an uphill battle that only I want. Regardless of what he says.