How can I make sure my guy friends don’t fall in love?

My best friend and I had sex I’m scared he will fall in love and I’ll hurt him. It felt great but he hadn’t got any for over a year and has told me even in past relationships it takes a while for him to be able to do it at first because he needs and emotional connection.

We are a great match as friends we are there for each other whenever. I know he’s always had a crush on me physically he never hid that the thing is I’m not in a good place for relationships the guy I’m in love with is married (we were both married when it started) Im a nice person but I’m terrible at resisting temptation, also my job is literally flirting with men which he told me he wouldn’t want his girlfriend doing that because he gets jealous.

How can I make sure my guy friends don’t fall in love?
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