Arguing and fighting isn't good at all. The outcome is not totally out of your control though. You choose how you respond to things and I think it's easy to let emotions drive you to say things you don't mean. If the relationship means enough to you (and I think it does) you'll always find a way to work through those times.

I'd stick with it if you can. It'll be worth it.

Think of your parents - they will have arguments and blazing rows, but most of the time they are really good together. People argue often because they care, they are passionate and have differences of opinion. Don't throw anything away without thinking long and hard about it...