Caught feelings for a one night stand

I know. I f*ed up. It’s not ideal I sleep with someone on the first date. It’s really not my cup of tea.
Unfortunately, I just haven’t felt excitement since a breakup from last year (can’t seem to get over it) so I would hookup here and there without catching feelings.

I matched with a beautiful man who happened to be passing through my city. I wasn’t doing anything so I agreed to go out with him to see where it goes.
He was even more beautiful in person, so polite, thoughtful, inquisitive, and wholesome (completely different from the usual rugged / douchey types I go for) and immediately became smitten. He was non-threatening, super engaging that led to deep conversations – didn’t come off as the playing the field type.

I’m not an attractive gal but I felt cute for once that I got to go on a date with someone beautiful inside and out – I feel like it reflected that he wasn’t shallow (I live in a big city. He could have chosen any other girl to have gone out with. But I was probably the easiest/quickest fix 🙄) but he quickly became someone I would love to have in my life even as a friend.
And I do a stupid thing and sleep with him. (Question for one night standers- do you immediately lose interest/respect for the other person when you do this?)

There honestly wasn’t much you can do out of this situation.

I’m truly just venting about my lesson learned but also, essentially, what could I have possibly done in this situation to have maintained a friendship ( obviously not sleep with him the first night) ? What could I have done for him to want to remain friends even in the slightest

Tldr: had a one night stand. Caught feelings for him. Never doing that again but what could I have done upon meeting him to get him to want to be my friend?