How should I end things?

Okay so he's cheating.
I even have proof...
This girl messaged me on insta and asked me why he had pictures of me on his insta '
I told her that he was my boyfriend and she said he was her boyfriend
So supposedly they'd been going out like for 4 months ( a year after me and him started dating )
So I guess my valentine day plans are off
Anyways how should I handle this
Wait to catch him in the act
Vote A
Confront him now. Try to try your best to fix things if possible
Vote B
Girl just end things don't put up with his BS anymore
Vote C
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How should I end things?
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