help me out

got drunk and high with this girl I was kinda interested in. cut to a little while later, we were full-on making out. I felt fine after she left that day and even texted "i can still feel you on my lips" .
But the next day, i felt so fucking gross when i remembered making out with her.
i stopped replying to her texts and stuff.
Idk why this happened, maybe because it was casual?
i'm fine now when i remember it tho.
if someone can help me out in figuring this out, it'll be great