<human>: Give me the gist of the text in a nutshell

My ex of 4 years and I broke up on the 24th of November, 2013. She cheated on me earlier that same day and then called me to talk, telling me she had slept with someone else and then actually telling me that she wanted to take a break after it had happened. She told me it was a mistake that it happened, and at the time I completely believed her, and forgave her. 

She continued to see me up until my birthday in December, acting like everything was still the same, and continued telling me that she loved me and everything would be okay. However, not long after she told me she was no longer in love with me, and that she did not want to see/hear/talk to me ever again. Although it hurt, I agreed with her and prepared to part ways on good terms. But her friends started harassing me on the social sites I am on.

Apparently, she had started telling everyone I had neglected her and not given her the attention she needed, although anytime she was upset I would hold her, and ask her what was wrong, wake up at any hour of the night to console her, and go to any length to cheer her up. Somewhere along the way she began talking to the before mentioned guy for support, and telling me she was okay while she may not have been, and I couldn't read her mind.

Throughout the harassment, she began talking to our mutual friends, and managed to convince all of them as well everything was my fault, and completely isolated me. She's been giving some of my stuff away to others, while demanding everything off hers (which I returned, undamaged and in excellent condition). Fast forward to today, and I have no real friends left, I get talked badly about by anyone who knows her and she's managed to have me considering moving out of town from how badly everything is. Does anyone have any advice/insight for a good way to deal with this? I've been shrugging everything off because I didn't want a confrontation or to burn bridges, but I'm not even sure a bridge is left.
<bot>: ex has managed to isolate me completely from all of my friends, given away things that were important to me, and used her friends to harass me to the point of not wanting to be in town anymore.