I know that feeling, and it sucks to know you've hurt other people. It shows you have great compassion and remorse. Try not to beet yourself up though. You're human. We all make mistakes, and even ones that hurt others. The best you can do is apologize for it, and if the apology isn't accepted there's nothing more you can do except learn from it and try to do better next time. Pain heals in time... and your own pain will too. And people who cannot accept apologies? Well, I think it shows a lack of compassion and understanding on their part for someone going through a rough patch. Go easy on yourself.

Hugs.