I met a girl who was madly in love with me about a year ago, but I was so scared falling for her. I was relentlessly in love with her but she was so hopeful. But by the time I became conscious, she stopped seeing me, calling, texting and was seeing someone. I confronted her about it then she stopped talking to me completely. Now I really want her back. Please help

Sounds like you lost your chance. She probably didn't take the rejection very well (or however you handled it) and she moved on. Now she's with someone else. Leave her alone and find someone that isn't already attached.

You blew your chance and should regroupand get over it. We all have gone through this lost opportunity, so don't make a pest of yourself or be foolish and compromise your dignity wanting something you can no longer have.

Truthfully I can't make sense out of what you said. You were 'relentlessly' in love - what does that mean? BUT she was hopeful? Hopeful about what? That you would stop being so relentless? None of that makes no sense. Then you became 'conscious' - what does that mean?
If what you mean is that you acted casual about your feelings for her because you are afraid of love, THAT would make sense.
If you mean that you didn't miss your water until your well ran dry, THAT makes sense too. It's unfortunately too, too common. Live and learn for the next relationship. Chances of getting her back are gone. You let her know and that was your one shot. Any more is stalking or harassment or both.