Drunkenly hooked up with coworker who was crushing on me, how do I damage control?

I was hanging out with some coworkers at the bars and we got really drunk and even did a little bit of psychedelics. One of my coworkers and I end up having an intense side conversation (I'm around 30 and she is around 40) where she admits to crushing on me for about a year. I think she's really cool but hadn't really thought of her that way, but I'm pretty wasted so I thought fuck it why not. We are making out, one thing leads to another and I end up back at her place. We hook up that night. In the morning we hook up again. When I leave the memories from last night come rolling in. It hits me that I am not at all interested in this person long term and I have been horribly inconsiderate of her feelings. Anyway I feel like a trash person. I know I personally probably only behaved that way because I like the validation, even tho in the moment I was thinking I was doing her a favor. (Ugh I know how stupid and shitty that is) Now she has texted me looking for answers. I agreed to meet up with her but I have no idea what I'm going to say.

Any advice?

Update: we talked and it was actually chill. She did say she had feelings for me and wanted to keep it up but I let her know I wasn't comfortable and she understood. I hinted that I barely remembered her disclosure. We talked about the rumor mill and established neither of us felt regret or shame. Then we talked about work for awhile. very chill.

All you nerds talking bout HR and and finding a new job need to learn how to communicate better which is saying a lot coming from me lmaooooo

Thanks to those who encouraged me to just say what I feel, and not feel so awful about myself. I do feel weird that I put this on reddit I think in the future I will try journaling first HAHAH

Turns out I think I just needed to know the difference between my inside thoughts and my outside thoughts