How to talk to girlfriend about moving out alone?

Me and my current girlfriend have been together for 5 years and it was perfectly fine and happy, we would barely fight but we’ve moved in together about 2 months ago and I feel like we’ve fought more times than we’ve ever have before over the most simple of things and I don’t exactly know why. I don’t want to move on my own but this clearly isn’t working and I’m tired of the fighting. Any ideas of how to bring it up and not have it be another world war 3.
How to talk to girlfriend about moving out alone?
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