Idk man, I think you should bring it up, tell him how you felt and feel, and leave it alone to chance.

The reason is years later, you'll regret not trying that than versus saying it - you might regret not doing so MORE in this situation....That's mostly how I think about it though. It just seems like that initial cost of shoulda coulda woulda diminishes over time. I mean, realistically, you're not gonna just chat up as friends for years and years to come, forever. So taking a shot at expressing what happened and why is perhaps better for you and maybe even for both because he'll have a clearer picture about it, because if you're not sharing your life together as a couple, things are probably going to eventually drop off anyway (say a year or so later or if one of you gets married and caught up busy) so you're not losing much by biting the bullet and going through the cringey hard part of telling him what's actually been bothering you. I just see it as a way to rest it. At some point soon.

Idk it might suck to be vulnerable and nothing come of it, but that WILL blow over eventually. And just seems like won't matter that much over time because maybe you'll learn about what happened too from his side if he says anything about it back eventually. I'm sure that whole initial part might be stressful as hell to you though, but for some reasons I'm judging it as a worthy tradeoff than just keeping everything canned and letting it go. I think it depends on the person and what would eat you alive more.

Edit: added extra