Can you be friends with someone you kissed?

My husband is 30. He was invited to a wedding from his college besties the other day. What really bothers me is he mentioned a while ago that he once “hooked up” with on of the friends in the group and they decided they would never do that again and just be friends. He said it was just a kiss (why even say hookup?? If it’s not?) and I didn’t care much. When he got the wedding invitation I asked if that was the girl he kissed and he said no. It was the other friend since it was two girls and two guys (including him) in the friend group and he other guy actually hooked up with one of the girls. To me, this doesn’t sound like a normal college friend group to have. My husband has old photos of the girl he kissed on fb and I honestly thought they were dating when he was in college. Because he has a good 3/4. Mind you, he said this happened his freshman year of college so maybe I’m over reacting. I just can’t help feel annoyed because I would never kiss a friend. At the same time, he didn’t have to admit that to me and it’s good he was very honest. The girl is also married and he said they catch up through text a couple times a year to see how they’re doing. I just can’t fight feeling really annoyed by him for telling me something that is bothersome. It was what like 12 years ago but still 😂 they seemed a little too close to be friends and he got friend zoned by her? Ladies help, I don’t wanna act irrational. I kept it cool when we talked though.