Help?

My Girlfriend of a little over 2 and a half years broke up with me. Days after she wanted to get back together. I didn't. It's now been a couple of weeks. I feel awful from it and I want her back but I know I shouldn't. There is also a girl that has been helping me a lot the last couple of weeks and I've helped her through some breakups. We have been friends for a little over a year. I feel lonely. I don't know if I want to ask her out because I'm lonely or hurting or because I actually want to try something with her. I don't know what I should do right now