Ah man this sucks.

You're not gonna recover from this one anytime soon, and you have nothing to prove to anyone else. Take your time, the shame and self hate is going to be overwhelming but that's to be expected. The only thing you did wrong was love someone who showed you love, don't forget that.

Honestly, saying something isn't worth it. If you are not trying to save the friendship then it's not worth your time. He won't listen, he thinks he did something funny. Maybe one day he will learn and feel empathy for other people but from what you said here he is a sociopath and wouldn't understand a word you say to him.