My five cents:
I agree with BeBrave483. It is hard to move on from things like this, it will be tough going but so totally worth it! Hugs to you that you have the strength to get through this.

I wonder if it might help to come up with an action plan. What I mean is that you could decide on an action say 'I will do 10 push-ups' (whatever it would be). And every time you get anxious and really want to contact this ex-friend of yours or check her online status, you would do the 10 push-ups instead.

What do you think your action could be?