Is OTHER wrong in the post ? POST : Several years ago, in a drunken sort of way, I hooked up with a girl I had been flirting with for a bit. We didn't end up having a romantic relationship, and it never got sexual again after that night. We did, however, manage to build a long-lasting friendship and now I consider her to be my ride-or-die best friend. 

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For the record, I identify as sort of bisexual, but I'm much more interested in dating men nowadays. Random hookups are out of character for me, now, as well. 

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 My current boyfriend found out about the encounter through the grapevine, but didn't tell me that he knew about it until I mentioned having gone to karaoke night with said friend recently.  He got really quiet and terse with me, and when I inquired about his sudden change in demeanor, he said that he didn't like it when I spend time with someone I've slept with in the past. I protested (she's my best friend, that was years ago, not interested in women, not a cheater, etc) and he was unmoved. He doesn't say outright that I shouldn't see her or talk to her, but every time I so much as mention her or if he finds out I talked to her, he closes up and gets angsty in a similar manner. 

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Am I the asshole if I want to hang out with my best friend anyway, in spite of his feelings?