So there's this girl and I really like her and she likes me but she use to go out with this other kid also and now she's starting to lose feelings form him and gaining feelings for me but the thing is that I really don't know if I should keep trying anymore because she said she's not really ready for a relationship right now because and I really want to wait also but I don't know if I should ?

What would you be waiting for? You move on. Don't not live your life in hopes of her being ready someday.

But you see its not that easy to just leave when you both have the same feelings for each other but when those same feelings are given to someone els also so I don't know what to do I want to leave but I don't because I been threw so much with her that's its not that easy anymore

You need to wake up. This relationship is dysfunctional. When you get tired of playing second fiddle, the back up guy, you will walk away. Until then, stay in limbo.

I kind of see what you mean but I think if she tells me that she dose not want me in her life , her self. I won't leave its really hard and it herts to even think about it like she's trying to forget the kid too that's what keeps me coming back

You don't want to do what you should do, so no matter what advice you are given, it does no good. So you just hang around and miss out on meeting the person who is right for you.