How to make this girl talk to me........(Again)?

OK OK.....here is the deal.......this girl that i know is my friend or wanted to be my girl but i was in a relationship and still am..... i know this is sad and stupid but i was talking to her and she wanted to hook up and i walked away from it.....and i did it again....so after a year i want to start talking to her...lot like hooking up but like friends but know every time i hit her up she doesn't write back or anything and i tell her whats wrong but she don't say nothing......i cant stop thinking and i feel guilty but i cant help but to always have her on my mind.....can anyone help me out....i need to speak with this girl again......HELP plzzzzzzzzzzzzHow to make this girl talk to me........(Again)?
As they say, most people thrive to want what they cant have:P

But just tell her ';My girlfriend threatened to break up with me because i was talking to girls and i didnt want to lose her, but i dont want to lose you either, your a great friend and i would really like us to be friends again, i know what i did was wrong but i cant help that i am pretty attracted to you too. please forgive me.

and if this dont work im sry.How to make this girl talk to me........(Again)?
get over it your being selfish stick to 1 person
you turned a girl hook up down... she is not going to talk to you... she probably found someone now.