I don't want divorce all the time but...?

I have a toddler. I never want a divorce. I'm married and we have a child. I keep not wanting a divorce ever. I want to be married to one and only one person for the rest of my life, but my husband is such a disappointment. Everyday I'm a nice giving wife and wonderful mother. Everyday he disappointments me and I feel defeated because I think he'll never change for the better. I'll be constantly getting angry with him everyday at stuff he starts with me the moment he comes home from work. My son loves us both and doesn't want the arguing. I keep not ever wanting a divorce and think why can't my husband just be a good husband so that we dont' have our child in a broken home and be another statistic. What to do help? Is change possible?