My FWB has a girlfriend, but is cheating on her with me? What do I do?

Anonymous
Me & my ex broke up over a year ago & for 5 months we've been FWBs. We've had no problems, everything was fine until on Facebook it says he's in a relationship. I asked him about it but he said he was just messing with the settings.

But when I creeped again it says the anniversary and stuff. And when I checked he cheated on her 3 days after dating with me.

I don't know if I should confront him about it?

Or if I should ignore it and continue sleeping with him because I like doing him.

Help.
My FWB has a girlfriend, but is cheating on her with me? What do I do?
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