Go back with your ex-girlfriend or find someone new?

Seriously, I think it's time for you to move on. If you like this new girl then pursue her, maybe she won't leave you for some sperm donor who treats her like crap. I think this is a learning experience for you. You experienced being with a loser person, so when you find the right person, you'll realize when you've won. Sure you think you love this lady now, but when you get to know this new girl, you'll realize she has all the great characteristics your ex didn't have. I kinda have that feeling right now. I thought my ex was sooo amazing, but when I started dating my new boyfriend, I noticed that my ex doesn't have shit on my new man. Hope this helped :)

Move on. She sounds like she might want a relationship now because loser guy is gone.
Maybe another guy to take care of her kid. Give the new relationship a chance. I don't think I would fully trust the old one. No baggage with the new relationship and it could be a fresh start of something great!

I think you need to move on to the someone that you like. You do not want to be used because now she needs you. It is ok to love someone and not be with her. The guy will probably come back if you get together and she will go back. You will be left where you where were the last time

I"m only here to confirm what the others have said.:move on and concentrate on that person you really like. Don't lower yourself to her loser standards. Indeed you don't want the drama, and you don't want the kid either. By the way, of course she nows wants a relationship---don't be the sucker that gives in to her!

It has been long past moving on. on and off about ten years.. and my assumption is that she was the one breaking it off in these years. Then she finally had left you and had a kid from a loser, who treats her like shit. If she picks that over you, that means she had the least bit of interest in you at the time. Not only that but something has kept her from fully committing to you and she probably has never told you what that something was. She probably has the same feelings for you now as she had back then (or lack thereof) and still the reasons why she didn't pick you at the first place. But now that she is alone, with a kid, living with her mom, she doesn't have a better option and all of a sudden you seem to be the better option. The likelihood of her leaving you once she gets on her feet with your support and then finds someone else, 100%. Your facial expression at that point; Priceless.

I would say that you should leave past where it belongs and forget about the love you had for her. In fact, I could say that it most likely is craving for something you never had and not love. If you have someone who really like and be liked and respected by, don't even think about it twice, it is that clear.

Honestly I think its time to move on. Though you may love her, your heart will never be in that relationship as Wholly as you or she would like it to. Due to the child of another man, neither will she, she will almost always have feelings for that other man.

If you want things to work between the two of you then you can make them work but I think that would not be in the best interests of the two of you.

Good Luck!!