What do I do now, can I convince her to do what is right?

I have just come out of a long term relationship about a month ago, and I am now ready to move on.

I have liked this girl, lets call her Jane. I have liked her for a little while now, and had previously liked her when she didnt know I existed. I am definitely not afraid to express my feelings towards her, I have already told her..

One problem, she is in a very crap relationship that was good, but is now past bad.. only its bee going on for 2 years. I have told her time and time again to talk to me, and she does, I know a lot about it and I know her true feelings.

One thing I have NOT said, is to leave him as I can do a much better job. We are good friends, she knows I want more.. it was discussed between us, she said its best to be mates whilst she has a boyfriend (I completely agree)

It is just making me feel so bad as I really really do like this “Jane”. I know for sure I can treat her the way she wants, I know for sure that it will not wear off! its just so hard to see her go down, she is extremeley unhappy in her relationship but will not let it go.

Where do I start?

1. She trusts me
2. She talks to me
3. We have the odd lunch or coffee as mates to talk about this
4. We chat, txt and communicate on a daily basis BUT she still does not do what she knows is right. I have asked her what she should do, she told me exactly what I want to hear.

On the other hand, I am NOT trying to break them up, whatever she is happy with has to do. If they break up, I will be the shoulder to cry on.. I want to be there as a mate and hopefully I can take it from there at a later date..

Theres the story, my question is: What do I do now? Im in a very frustrating period where she is stalling, avoiding the situation and not being fair on herself..