Is she playing games? If not then what's going on?

Yea sounds like it, ignore her for a while then see how she reacts.

she probably doesn't know what she wants... or is confused about her feelings for you!

been there done that. all you can do for yourself is stay friends and nothing more. all you are going to end up doing is putting yourself in more hurt than being happy. I say to you stay friends don't loose that if she means anything at all to you.

I think she is really confused and is not thinking about you at all. She is putting your heart in a blender because she is focused on whatever she wants at the moment.

I think that there could be two options, firstly if she was in a controlling and probably emotionally abusive relationship she is having a hard time adjusting to not being in that kind of relationship. It really emotionally drains you when you are being controlled by someone because it makes you go crazy. Which would explain her freaking out on you because of something that may have happened to her a lot called "gaslighting". Soo.. there could be two options she is either not over her ex and is still hoping to be with him or she is confused by your actions and you being a nice person to her. Honestly, I would say that she is not over her ex and needs a lot of time and support to get through it... maybe that is where you come in because she gets support from you but not in the way you desire.

She doesn't feel the same way it seems to me

You should bow out and leave her alone
She can't be with you

Y'all should just stay friends

Sounds like a game. Your always there when she wants you and you oblige. It's simple, if she wanted more, she wouldn't have waited 3 years. I would stop contacting her and don't give in. Maybe she will pull her head out if you make her chase you.

shes a wreck, just watch out for yourself.