<human>: Provide a brief overview of the text.

Lately my girlfriend has been acting out of the ordinary. Last week I found out she was blocking people on Facebook by going on my phone, and for the first time in our relationship she locked her phone with a fingerprint. She used to use a swipe and share the swipe code with me. When I started to look around our room for evidence of cheating I found her old phone, and it was still signed into her facebook messenger.

This was sent to one of her friends:
"So this guy I'm going to see today (Monday), I fucked him like 3 times Saturday. No regrets. Best. Sex. Ever."

Obviously this really hurt and I confronted her about it as soon as I could. I asked if she was cheating, she said "no, I promise" so then I show her the picture I took of the conversation and she hits me and runs off to the living room crying, trying to place the blame on me. I told her she needs to move out as soon as possible.

My problem is she is telling everyone that I only *think* I cheated on her, not admitting she cheated. I'm tempted to post the proof somewhere or send it to her friends and relatives so she can't get away with this shit anymore. What do you think, Reddit?
<bot>: Girlfriend cheated, got picture proof of her saying she fucked some guy and loved it. I want to show it to her friends and family, is that going too far? Or should a cheater be exposed?