Communication is really the hardest thing in a relationship. You really have to work at it. That's one issue I've been dealing with in my relationship of 3 years. And as someone who deals with mental issues and being in a relationship with someone who has a hard time controlling anger (not that I'm trying to compare or describe your relationship) and after 3 total years being together, with 2 of them being very troublesome due to our lack of communication. Some days I feel like up and leaving, but that's' just me because I'm impulsive. I don't know if you argued a lot or not, maybe she kept it in, you'll never know but what you do know is that you can't try and figure out the answer, you just have to know between good and bad and stay positive and good things will come your way. Stay strong, I'm dealing with relationship issues today, not very fun. blehh.
I am so sorry... People who cut and run like that make the excuse often that their partner will 'be better off without' them, but they are so selfish that they do not see past their own needs and desires. You deserve so much better than that. My heart is with you today...