Should I tell her how I feel?

I like a girl and have been getting closer to her, but she still has feelings for her old boyfriend.

Her parents don't like her ex and his parents don't like her, so they were pretty much forced to break up. They both still have feelings for each other and would be dating if it weren't for their parents. They barely see each other anymore.

Everybody knows that he's bad for her, but she doesn't realize it. I'm one of the classic "good guys" and we all know that usually doesn't pay off.

So now I have no idea what to do. I really want her to know, but I don't know what to do.
Should I tell her how I feel?
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