All we do is argue- how do I put a stop to it?

I've been with my girlfriend for 8 months. I love her more than anything and she loves me back. But we argue, constantly. It's almost every day. 

She's talked about breaking up because we're both so upset every time we argue. We want to be together forever but the arguing is killing us. Do we stay together? And if we do, how do we stop the arguing? I love this girl so much it is ridiculous and I want to marry her someday. Please, just tell me what I should do