Are you sure he doesn’t know? Like with 100% certainty? H could’ve gotten in touch with him through the birthday girl or some other way. You never have to tell your SO you cheated because something changes immediately and there’s some way to tell.

“I made an adult decision and now I’m paying the prices for said choices which include, realizing I made a mistake, my BF ghosting me for a completely valid reason, and getting called out for it on the internet.” Is the only way to read this.

Yes, you realized your “mistake”, I’m calling it a decision as someone that’s been cheated on, and that’s growth, but at the same time, He should completely ghosts you. It’ll feel a fraction of how bad as he must’ve felt when he found out.

I’m not saying you’re a shitty person, but you are. Learn from this and grow to do better in your next relationship should you get one