<human>: Could you distill the essence of the text into 1-3 sentences?

We have been dating for 3 years. She went to volunteer abroad last month (we planned to stay together) but broke up with me a week after she left. She then hooked up with a guy she met several times and I cut all contact with her.

Yesterday the guy she hooked up with messaged me bragging about hooking up with my girlfriend (seriously who does that?) and he said it's funny because she likes him and he is just fucking around with her. 

As I still care about my gf, I sent her a screenshot of what he wrote to let her know so that she doesn't get hurt (pussy move I know but I still care for her even if I want nothing to do with her anymore). 

Today she calls me and left me dozens of voice messages crying and sobbing about how badly she screwed up and how much of an asshole the guy was and how she cannot believe how poor her judgement was and her choices were. I've never heard her this sad in our entire relationship.  She was hysterical and sobbing and I could tell it was genuine (we have been best friends for a long time). 

Obviously I know the correct thing to do is to say screw her and just ignore her. And while I don't want to get back together (at least not now, if ever) she was my best friend and the best part of my life and I hate to hear her so sad. I don't know how I can comfort her but it's breaking my heart to hear her feeling this way (she has been calling me for almost 24 hours now). What am I supposed to do?

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<bot>: Gf broke up with me, hooked up with someone else, realized he was an asshole, and now is distraught because she realized she ruined our relationship.  What am I supposed to do?