(we are in high school)she gave me signs that she liked me for a month in a half, two months( November - December) I didn't pay attention but I liked her. She got a boy friend in January, I feel like an idiot for not taking what could have been mine... I want to be with her.. what the hell can I do? I know she still has feelings for me, I can see it in her eyes... I just want help, suggestions?

You didn't respond to her signs and signals and now she's with another guy. I don't think you can do much then to wait it out and pray that she break ups.

OR

You can see if any other girl is giving you the signals and respond to her.

On this particular girl, I think you've missed the train...

You ned to get her alone and talk to her about it. Don't do anything that would make it look like you would want her to break up with her boyfriend, that is the wrong thing to do..