I think it’s time to really back off.
You know he has a girlfriend. And even if he said it’s currently complicated; it’s irrelevant and it doesn’t matter. He still has a girlfriend.
I know after everything that has happened this year, you feel like you deserve some sort of happiness. And you do. But this is totally not the way to go.
The past two weeks since the drunken incident happened have been filled with guilt, curiousity, regret, excitement and everything in between. There was chemistry and sex happened. Big deal. Just leave it at that because you know how much it’s been affecting your mood and day to day sanity.
So for everyone’s sake (and your own especially), let this one go and back the fuck off.