BPDFamily.com

Last week I finally after more than 15 years of struggle told my GF that we are over. It was a tough decision and especially since we have shared so much over the years.
I know it was bad of me since I was actually on the road when I did it but I just freaked out over her behaviour against me over the phone. I know it is wrong doing a breakup like that.

Instantly she made threats to kill her self, taking pills etc. one of our 15 year old daughters were home so she managed to stop it with the help of her older step sister.
She made another threat like that over the weekend but it went well again.

Then she came to me and said that until she moves out she wants us to try to be what we actually should have been just to show the children how a normal relation is supposed to be.
So she wants me to be loving towards her and she now wants to kiss and hug me all the time.
It feels very, very awkward since she have never been like that before.
She have changed her Face Book name to what I have called her over the years, which she have ignored before. A loving little nickname that I have said out of love. 

I feel this behaviour to be desperate actions and not something coming from love.

Sounds like fear of abandonment. The suicide that's and attempts are horrifying.   Talk to a professional on how to deal with those. Good luck.

That sounds very manipulative on her part.  The kids know that the two of you never acted that way.  You can't really fool kids, especially ones as old as yours.  The kids would learn more about how to maturely handle their emotions if you do the mature thing.

Do what you feel is right and be true to your feelings.  You don't want her to feel so terrible, so let her know.  But you can't rescue her every time either, so she needs to get support from somewhere else.