I'm afraid I'm going to push him away?

I am in a relationship with a guy that I am madly in love with, I have always had a crush on him ages before we were together and never thought I would ever get with him because he is like my dream guy, I am with him and it couldn't be better, he is even better that I am imagined going out with him but I am afraid I am going to push him away. Sometimes I can be quite a grumpy, I can argue quite a lot and I feel myself doing that quite a lot with him, I don't mean to and I don't want to. I mean I wouldn't say we argue or bicker any more than other couples but I don't want him to fall out of love with me. We do talk about our arguments after we have one, if one of us is in a bit of a bad mood we also talk about it after so that's good because we don't bottle anything up. I want to be the best girlfriend for him. He is the best boyfriend for me