Don't Know What to Do

I've been trying to save my marriage for a long time now. But we always seem to go back to fighting. I don't know what happened we used to be so happy. But the last few years have been hell. We thought about splitting up so many times but don't want to give up. I don't want to get divorced I have two kids to think about but we just can't seem to get along. He blames me for our marriage failing. I admit I haven't been the perfect wife but he needs to take a look in the mirror he's far from perfect himself. Just the last few weeks all he does all day is ***** and gripe about every little thing. He acts like a complete *******. Sometimes I have to just get in my car and drive away and stay away from the house for  a while just to keep my sanity. And sometimes I feel like I'm married to my dad or my grandpa. He acts like an old man. I look at my grandparents and I notice that all the do all day long is curse each other out in French and English and I know that we're just going to end up just like them. It's so sad and depressing. I just don't know how to save this marriage and I'm so tired.