Will Kharma come to get her?

So im 27 and got dumped by a 21 year old bomb shell a little over 3 weeks ago. It's been really hard for me getting over this one even though we weren't together for more than 5 months. I thought this was it for me and i put 100% effort into the relationship only to find heartache. Every time i feel like im on the road to recovery i end up seeing her out or she'll post some kind of facebook message that people will tell me about ( i deleted her ) and i know she's purposely doing things to get at me. She has never been hurt before, she's always broke up with every boyfriend she has. She is very selfish and i hardly recognize her these days with the way she is acting. Talking to all these guys etc. last night i ran into her at a bar and i should of left i know, but seeing her made me want to stay. She ended up leaving hand in hand with a guy i know, so of course me being drunk texted her and said something dumb. She then called me at 3 in morning saying she doesn't care about me blah blah blah. Anyways for every 2 steps forward i take, i feel like i take 3 steps back. I need to erase her from my mind but im so sensitive and i think about things way to much. I do love her and picturing her with another guy kills me. I really want her to feel the pain that i feel one day, but with her looks i don't feel like she will ever experience the pain that i have felt. PS: the reason she broke up with me was she said her feelings had changed,,no signs what so ever either, she always told me how much she loved me and she really put on a good show..but i guess this is who she really is. Our relationship was so so good and because of a family fight she had one night everything just turned all at once (her family wants us back together). Now she is all about being wild and guy crazy and its just not like her or maybe it is. And as bad as it sounds, i feel like i need a new girl to help me cope with this, but that would be the wrong thing to do and not fair to the girl.