How do I get past my crush kissing my friend and the idea that she knows what his lips feel like?

Exella

This guy I like kissed (multiple times at the club) a great friend of mine because he was super drunk, desperate, and was trying to make me jealous (this great friend in particular has been into him for a while and he knows it. I like him as well and I know it's mutual but I feel bad for her so I ignore him, although we've kissed one night, I felt bad immediately and stopped everything).

Anyways, the point isn't is he an idiot or what should I do or how should I feel, or about my friend's feelings etc., but more about, if I end up pursuing something with him one day, will I ever get past knowing he's kissed her, knowing she knows how his lips feel, and he knows how hers do? I'm not scared of her, just possessive and jealous that she also got a taste of my 'special' thing I had with him.

How do I stop feeling this way? And don't let this dumb kiss ruin anything if a relationship happens between us at some point?

Also, as a guy, what is going on in your head after that? If you were him, after this happened, dating me, and seeing said friend, would you think about the kiss often? Would you think about it while kissing me? I know I'm being paranoid or whatever but I don't know what goes on in guy's heads.

Updates
1 y
By 'special' thing I mean that she got to have a cute moment of her own when I thought cute moments like that were our thing between me and him.
How do I get past my crush kissing my friend and the idea that she knows what his lips feel like?
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