<human>: Been together for four years, the last one being long distance. Out of the blue last week she texted me telling me we needed to talk on FB, yes FB, not even a phone/skype call. She tells me she can't do it anymore and is going to pursue another guy. I'm shell-shocked and sort of just 'ok, good luck in life' it off since I wasn't sure how to approach the situation then and there. 

I realize I don't want it to end so I keep contacting her through email and text but don't get a response. Thinking it was over for real I do a dating site where I've already met a great lady but she has no idea I'm fresh out of a relationship and hurting badly inside. Nothing serious at all at the moment with her though, only a bunch of texts.

Now I just spoke with her sister who claims ex-GF is a bit of a wreck and regretting the break up. I'm supposed to meet this new lady this weekend but I'd feel terrible for everyone involved to maybe start something with new girl then go running back to the ex. I know she did me wrong with the way the breakup went down but I can't deny I still long for her. How to deal?

Summarize the given text in a few sentences.
<bot>: Long term GF broke up with me in a terrible way, met a new lady on site whom I'm suppose to meet this weekend but still long for the ex. Help pls.