<human>: Give me the gist of the text in a nutshell

I was seeing my girlfiend for about 6 - 7 months everything was going great then out of the blue she says this isnt going to work. 

I was really bummed out and depressed, she would avoid going in depth as to why?.

 we ended things on goodish terms between each other still wanted to be friends, but now she massages every 2 - 3 days telling me about all the fun she is having and how she has found a really great guy (which kills me haha), but i suck it up and tell how awsome that is still being friendly.

So I dont message her for a couple days trying to get out of my deppressed state and pick my self up again, then all of a suddon the tones of her messages turn cold, short and nasty, and im kind of stumped as to why this has happend? 

I thought we were all good.
<bot>: messages from ex GF (who left me) bragging then blue trys fishing for an argument. why is she doing this?