I'm sorry for how you feel, and this internal conflict that youre having. If the person blocked you, I think you should respect their privacy and their decision. I'm not bashing you but I think it's important for people to understand: You don't get to pick how the other person deals with the hurt you've caused them. I'm the type of person that will block someone and never look back. To me an apology means absolutely nothing! I don't wait or look for apologies, I always wonder why did they do this to me? Once that door is closed, I just don't ever reopen it. Perhaps you can say that's way of coping, maybe unhealthy, buy it works for me and that's how I process things.
You have to be careful how you treat people. You never know someone's back story. If that person trusted you and you did something you may think was small and easy for them to forgive you, they may view the situation differently. That person has simply taken the power of silence and decided to completely ignore you so that you can stay in limbo forever for what you did. I have no doubts that person is fine and has recovered from whatever. So, it's best to pray (if you do) ask for forgiveness and respect that person's decision to cut ties. Don't beat yourself up for the rest of your life, we are only human and will make mistakes, some may cost you forever without that person. I hope you can find some peace in all this. Wish you the best.