She's not worth it, she went out with a guy before you and she is pregnant with him.
Just forgot her, she has her own life now. You have your own life.
How old are you? I'm sure you have plenty of options and opportunities. Start going out, mingle with people, make an online profile, go to speed dating events, join clubs, do things for fun.
Have aspirations, goals, do things that you find interesting.
Good luck!