People getting involved in my relationships?

So, I had a bad time with my ex. It wasn't healthy, and we went through a period of breaking-up and getting back together. Whilst broken up, I slept with someone else. I regret it anyway, totally out of character, but whatever, experiences shape you and all that blah. One of his female friends (well, less of a friend, a housemates girlfriend who came to visit occasionally) started calling me a slut and slag on Facebook, and telling my ex boyfriend that he should never get back with me. I wouldn't have blamed him, but we gave it one more shot. It was too difficult for him to get over, and for the sake of our sanity, I broke it up for good. The girl continued to send me abusive messages over Facebook, so I asked her to back off and focus on her own relationship. This is a girl who admits to her boyfriend hitting her and cheating on her. She has also cheated on him. This was well over six months ago. I now have a new boyfriend who seems to be the perfect match :) I've never been happier. But as soon as we became 'facebook official' she started sending messages through her boyfriends account to my current beau. She tried telling him I was a slut, that I made nasty comments about their relationship, that I mess guys around, and that I was insulting to her. The only comment I ever made about her character was that she deserved better, and it just upset me that she had been so two-faced to me. Luckily, my boyfriend is aware of everything, and understands who she is. Two weeks later, after a night out, we woke up to find messages in his account telling him I'd been contacting my ex, and trying to get back with him. This is all total BS! I would never ruin what I have. This took a lot longer to convince my boyfriend about, but luckily he believed me. This girl has now taken to posting on Facebook and twitter about me, stirring up rumors that aren't even true. What can I do? I'm trying my best to keep my head high, but when someone is continually making vile comments on the internet about you, it's hard to move on with your life. I don't even understand why she hates me so much, I'm no longer with my ex, so why is my life bothering her so much now?

Put the internet to work for you. via Personal Recipe 2629979