How Do I win back my ex-girlfriend?

You said she said "You don't appreciate me" You said, I did appreciate her, BUT, you DIDN'T really show it. Well, how is she suppose to know you appreciate her if you are not showing it? You love her? Show her. If she is text messaging, and e-mailing you she obviously still feels something for you, but I could also see where you would feel confused too. What I don't understand is why you are changing for her, I mean, it's cool that you are working out, exercise is good, going out buying clothes is cool too, but, the changing is something you do for you, not someone else. Were you working out, and wearing new clothes, when you got together? Always, first and foremost, be yourself. I know you want this girl, but you shouldn't have to change who you are to be with her. She said, you didn't appreciate her, not "You don't work out', or "You don't have new clothes", so why don't you go out, and buy her a rose, and a nice card to go with it, take the time to read the card, and pick one that explains how you really feel, take her out to dinner, (not McDonalds, or Taco Bell) somewhere nice, that serves the type of food she likes. Tell her how you feel, tell her your confused, tell her you love her, tell her you don't want her to leave, tell her you want her back, and see what happens. Should she find herself back with you, once in a while, SHOW HER you appreciate her, don't stop because you have her back, most women like romance, always SHOW HER, you appreciate her.

I agree with the guy! You should tell her and let her decide! Good luck!

Tell her you miss her and spoil her crazy you'll get her back in a heart beat when you go to try to get her back take a dozen roses and kill her with kindness

Easy, tell her you love her. You both have feelings, why give hints to her or try to make yourself more attractive when you with her? She already love the way you are, there's no need to change, you just need to tell her you love her, want her to be in your arms and care her.

You can do what the first girl said, and spoil her with kindness. That's part of how to get rid of a girl in 3 days.
Get her alone, not at your house, but somewhere that you can easily exit from. When you have her attention, say "Hey, I still have feelings for you and I would like to get back together, but that is completely up to you so call me if you want to do something Friday night. " Then you walk away or drive away. Don't walk back to her when she calls your name. Just look over your shoulder and keep walking.
Give it some time and if she calls you, chances are she wants to get back together. If not, you have to move on and learn from your mistakes.