<human>: She left me for someone else she met online 3 months ago.
I'm studying abroad, so it was difficult for me.
So from a friend I found out, that our old friend she is still in touch with ( im not) told her lies about me when he was drunk, like how I used to talk smack about people and talk smack about her when we were together, the point is, I NEVER DID ANY OF THOSE THINGS.
I have evidence, written evidence that those people told lies to her, i just cant believe she believed them and never asked me. we were NC for 3 months btw, and she was my first.
Now im back after finals for winter holidays, and I dont know what I should do, should i go and tell her the truth that I never did that or not, i dont want her to hate me.
I still love her, and would love to get her back, but im managed to survive on my own for 3 months by now, and i feel much better.
Hew new boyfriend is only coming to visit her in january (they never met and say they love each other)
What should I do?

Condense the text into a few key points
<bot>: Ex of 3 years believed in lies about me, and i dont want her to hate me. should i tell her the truth?