It is OK to be single. Your reasons are the exact reasons why I'm single and don't date.

Maybe she had a friend that's also a guy that she just ate with? That's possible.

It doesn't mean she can't relate to you because she's in a relationship. She doesn't have to share your pain to care and be able to help. Feel better soon, OK? There's nothing wrong with you. You'll get there in your own time.