You just need to talk as well as well as really try your best to earn that turst back. it's not gone completly but think before you do it, if you have doubts about something talk with that person about it. don't hide it, think about the reasons why you would do it and the reasons you don't want to. express in words as well how you feel and not only in writing (if thats the case) if you are again someone that they can trust completly they will let you know as well as try to make time to be with them as well if you already aren't able to see each other that much thats all i can do to help. what your going to do is up to you.
OatmealPecheneg
Wow, stop self beating, you are not a jerk. This is not deadly mistake. Not dead end.