She isn’t obligated to tell you anything. Wasn’t it you who pulled the first disappearing act on her, in the first place? What goes around comes around. She wasn’t even obligated to get into a relationship with you after you begged her, or to stay friends with you when you cried for her to stay, which is kinda scary and rather emotionally unstable of you. She left because she got tired of your emotional abuse and decided she was better off not knowing you anymore. You need to look in the mirror at your issues before you place on someone else. You cannot expect to get into a relationship with all that emotional instability going on within you and success in it, or expect a woman to want to stay with you and not get sick of you after a while. Next time, work on your issues so that the next woman won’t have to suffer, and put forth more effort and less blaming other women. Frankly, you’re lucky she didn’t chop your head off when you told her you were single and blamed her for everything that went wrong.
Answer: Leave her alone. Go get therapy.