Constant fighting... What do I do to fix this?

So... Been with my girlfriend for a year and a half. That kind of love that's... amazing. Once in a lifetime, she's the one. But for the past few months all we've done is fight. Argue, bicker, really mean, out of nowhere fights. and the time that we've been okay just keeps getting shorter and shorter. We're fighting right now... after literally only two good days. I don't even know about what anymore... I told her I need space to figure this out but truthfully I don't know if it's going to happen... I need help. Some advice anything to how to approach this and fix this... I love her so much... But if this fighting doesn't ever stop... its no way to love. So if anyone could offer some clarity... it'd be much appreciated...
Constant fighting... What do I do to fix this?
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