Colleagues doing a smear campaign or bullying or harassment

[Tunnock44]

I don't know where to start with this, I could easily write a book and then some more on what has been happening at work, so to cover it all would be impossible, but the main parts are...
A colleague that was a very close friend of mine for many years revealed to other staff and line management all my private life, she has used this information against me and is basically on a witch hunt. This colleague very much presents as the victim and plays it very well, she can turn on the tears and act so innocent on cue, she is using the guise that she has my best interests at heart, but that is so not the case, she is out to ruin my career.
I believe she is driven by jealousy as I have progressed further than her in my career and I have other people at work that I am friends with. She wants me to herself and to have complete control over my life, and as I have broken free from her, the vendetta has increased. Whilst my private life is my private life, I trusted her and I am shocked by her behaviour. I can see other colleagues whispering and know that she is trying to influence them about me.
I am worried with how far she will take this, how can I stop her using my private life as a subject for gossip and her trying to use it to ruin my career.

Have you got amn HR dept? You have to make this official asap and document everything no matter how trivial it may appear. Try and carry on as normal. Yes, i know! I'm sorry this is happening to you

Is there anything in this that affects yourr ability to do your job?

thanks, it is all being logged. No nothing in what she is saying about me impacts on my job, except small mindiness! I am entitled to a private life and whilst I made a huge mistake in trusting this colleague, they were once a friend and had been for many years before we started working for the same company. I am so shocked that someone that I trusted and valued has done such a thing, I have plenty I could tell on them but it would never occur for me to do such a thing as your private life is private. Plus once I have been told something in total confidence, that is where it stays, regardless of the friendship status. It is morally so wrong to do this but surely it is unprofessional too, I cannot trust this person ever again, our jobs do require us to handle sensitive and often contentious information about our clients, I Have to be sure that all information is confidential, but I am questioning her integrity now, if she can share and make fun of my utmost secrets to others, then what is safe!