He cheated on his girlfriend with me. Should I stay?

Anonymous
I met a guy on Bumble a few weeks ago. We seem to hit it off after a few days and we've gone on a few dates. We've also been intimate.
Overall he seems to be ideal. Funny, smart, attractive, good in bed, the whole nine yards.

Last night I was planning to add his social but when I found his Facebook I discovered he has had a girlfriend for the past year.
I confronted him about it and he claims it's been an on/off thing and it was more complicated than I thought. Said he's been "single" during our time together but as of 3 days ago he's back with her. He also said it was a bad relationship and it's difficult for him to just walk away.
He was very upfront with all my questions and seemingly honest. Regardless of all this, I'm still interested in him. However I don't want to be a home wrecker.

He's offered me space to help me collect myself and I just don't know how to move forward. He claims he's already expressed to her how unhappy he was in the relationship and that he plans to be officially split from her within a month.

What should I do? Should I wait for him to be single or should I dial back out contact until he is? Or leave out all together?
Leave and move on
Stick around and hope for the best
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He cheated on his girlfriend with me. Should I stay?
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