Ok, so I was dating this girl, we broke up, but then slowly started to see each other again, but nothing official. Then, I had a friend pass away, and got very depressed, and when I'm depressed I tend to go into a shell and ignore the outside world. While doing this I was stupid enough to block her out and stop talking to her because of my insecurities and depression. Then she went out of town for job training and days later slept with some random guy, who was borderline abusive. She tells me this and I feel like I've been punched in the heart, and I know it's my fault. But she claims it is her fault for being self-destructive when she is depressed (aka when i stopped talking to her), and wants me to forgive and move on and get back together. I honestly cannot decided what to do. I have feelings for her still but I feel betrayed in a way, even though I know my lack of judgement caused all of this in the first place.
Sorry to gush my issues but I'm so lost on what to do and think anymore.