Ex Girlfriend Relationship Help?

So I've had this girlfriend for 2+ years and we just recently split. Things weren't going as great as they used to be and we kind of just fell into the college grind and out of love. Now that we split I realize just how much she means to me, i mean, its not like i didnt care about here when we were together, i just never thought it would end. I took us for granted. Now, i guess we are going to try to be friends.

My question is how can i win her back? How can i show her that I care and that we are worth a second chance? I really love this girl and I can't just let her go. What should i do?

Okay maybe this was more than one question. Thanks in advance for reading and giving input.