Hey man,
I know it is easy to say, but try not to worry about this, every single guy on this board has been or is going through the exact same problem.
I am sorry to hear about you splitting up with your gf - always hard times, but I think you did the right thing by going out, however from reading your post, I get the impression you went out to pull, and this can only lead to bad things because then every interaction you have you will feel like you have to get something from the interaction such as a phone number, e-mail, kiss etc
When I go out, I go out with the only intention that I am going to have an awesome night, have some incredible interactions and meet some cool new people. With this mindset, I give across the impression that I don't want anything from the interaction with the woman/group. If I meet a woman who I am attracted too and we exchange information, kiss, fuck, then it just makes an awesome night evenm better, however, is not the sole purpose of going out - and I have found that this leads to better results, becasue the women can feel that you are just out for fun.
A lot of guys go out and force themselves to approach, and as a result end up failing, becasue they are acting like approaching and meting women is a chore, I should know, because I used to have the exact same mindset/problem, however, now I have so much fun meeting new people, purely becasue everyone has something interesting to say. If I get rejected, then so what, how can the people who reject you know who you are purely from whatever you say to open? 9 times out of 10 they are in a foul mood, for whatever reason and are not feeling very socialble.
But dude, just hang in there, keep going out. At times it can be rough, but just take the positives from the interactions, learn from them and put them behind you.
Plus you also have access to this awesome message board!