WOW, I commend you for your righteous approach. Yes, that should be the ideal way a G-d fearing person should approach an undesirable situation. Me, as a outsider, bystander, cannot tell you that. But yes, an earnest apology, truly making up, would certainly do. It certainly can heal.
One more word, if I may. I think you’re dealing here with a bochur. They’re also known to have mood swings. Big ones. So at any point in (seemingly random) time, he can, and we all pray should, make a sudden u-turn, full force, all engines burning, and head straight for a Bais Medrash, a refreshing dive into Torah, Torah life and Avodas HaShem. IT DOES HAPPEN!
May you see it b’karov!