Girlfriend thinks she caught me masturbating, and got REALLY mad. What should I do?

Anonymous
So long story short, I’ve been staying with my girlfriend during all of this CV-19 stuff because her roommate went home to ride it out. My girlfriend has a twin size bed, and while cuddling can be nice, we’ve been together for nearly two years, so we’d rather be comfortable. So, I’ve been sleeping in her roommates bed.

Tonight, I was in bed, watching TV, reading on my phone, when my girlfriend came in the room to use the bathroom. I had one hand on my phone and one hand under the blankets. When she came in, it startled me and I jumped a bit. No words were said she used the bathroom and walked out. 10 min later, I go to get some water and she goes OFF!
She starts saying she caught me jerking off in her roommates bed, and gets really mad. I tell her I wasn’t jerking off, but she doesn’t seem to believe me. She calms down, and while she doesn’t seem happy, she doesn’t seem angry. I figure I will just go to bed and let her cool off. So about an hour later I come back out and she just goes “Get out of here, now!”
I didn’t wanna fight, so I just left. I don’t know what to do or say, because 1.) I wasn’t masturbating and 2.) Even if I was, is that really THAT big of a deal? I mean who doesn’t masturbate?
Help!
Girlfriend thinks she caught me masturbating, and got REALLY mad. What should I do?
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