VERY confusing situation! Please help me!?

This girl I like. She hugged me alot, grabbed my arm, asked me to walk her to her bus. One time, we were hanging out with a few friends, she was sitting alone on a couch. She called me over to sit next to her. I did, and she put her legs on my lap, and somehow, a few minutes later, our hands slipped together and we held hands. This was a few months ago.
Fast forward to a week ago. One of her guy friends asks her out. I could tell she didn't like him that much though because she still asked me to walk her to her bus even when she was with him.
Fast forward to 2 days ago. She told me that she doesn't want to date him anymore, and that she wants to get back together with her ex, who cheated on her before and who she broke up with 3 times before.
So yesterday she broke up with her boyfriend. I didn't think it mattered though because she wanted to hook up with her ex.
But today in class, we were looking at some pictures on the computer, and she put her head on my shoulder and her face right up against mine. She did that like 3 times, each time removing her face from my shoulder, then putting it back on again.
So I鈥檓 so ******* confused. What do you guys think?
Thanks!
Also, is it overacting if I get upset when she doesn鈥檛 say goodbye extremely enthusiastically, just with a smile and a 鈥渃ya鈥?

You like her. Tell her. Go for what you want. You may not get it if you try -- but you definitely won't get it if you don't try.

It sounds like she would like to be with you.

(also, ignore talk about plans for getting together with other guys -- she's not doing it and she's talking to you -- just smile and believe that life is good and tell her!)

Classic scenario of the girl who doesn't know what she wants! But give her credit, at least she's looking. I think this is a judgment call you're going to have to make, but I'll tell you what to look for. If you think she is stable enough to be with you and you only, then go for it, but she may be one of those butterfly girls who go from flower to flower, uncertain, tossed about by the wind, and you might not be able to pin her down. The least you could do is be a good friend to her and offer her some stability that way without you making yourself vulnerable.

And yes, it's overreacting...man, I hope you're not in too deep yet. Have an escape pod standing by, things could get a little rough for you if she's not ready to settle down. I'm friends with a girl who is like this, and am trying not to care about her that much...just being someone she can rely on. It's tough, and there are good days and bad days. So just be ready for her to not be into you like you want her to, but do what you think is best for you both.