I feel for you man.  She talked me into an engagement too.  Bought a ring and everything.  I knew what I was dealing  with and knew it would never go through.  In fact, was trying to formulate a plan to end things.  In fact I did end things a day before ultimately ended it for good.  I wish I ended it on my terms as I felt better about who had the power.
It has been much more difficult than I ever imagined.  She was on pof the same night we were done.  Has a big list of orbiters right now.  Don't think she will contact me again and I really hope she doesn't as that would just mean more pain.
I hope I get the courage to do what you did.  Maybe today even 
