Guys, Now what?

Talked to this guy as a friend for awhile, thought he was pretty cool. He has a girlfriend, didn’t think anything would ever occur because he said he’s not that type to cheat. We ended up making out once and there was some touching but that was it.
We still talk and have had some locked eye contact a couple of times, just nothing like before. He said he doesn’t cheat and doesn’t want that to happen again lol.
I don’t know if he is having a moment of feeling guilty or playing games or what lol. I’ll see him talk to other female friends in our group and he sometimes makes joking flirty comments to other people but not with me like before. Why would he tell me he doesn’t cheat then cheat with me then say it again then flirt etc? Why does he stare at me, hold eye contact for long periods, I’m so confused.

Guys, Now what?
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