My ex just wants to be friends but I am still madly in love we have a son together it hurts so much

My ex wife and I have just seperated 4 weeks ago, she has made it clear that she only wants to be friends now. I have tried everything from begging to giving her 2 weeks space and nothing has changed. She still wants to be just friends. I obviously want to be there for my son, but she lives out of state and I have moved back home to my parents. I said she could have the house and Im still sending money to her each week for our son. I havent seen my son now since before we seperated and I miss him so so much shes only willing to let me see him for a couple hours at a time, but its unrealistic for me to drive for 12 hours to see him for only 2 hours. I want to be there for him so much but I dont know if I can face seeing her yet. I dream about her every night and cant stop thinking about her still shes made it clear reconcilliation isnt any option, I just wish I could turn my feelings off but I cant! It hurts so much but I dont want my feelings for her to get in the way of being a daddy. Help! - My son is 2 and we were married for 5 years. (known her 6) Im 24 and she was my first girlfriend.

Update: July 05, 2009.
Its been building up for a while, we have had a few arguments recently she kept running to her mom for every little argument which really annoyed me she kept staying at her house overnight with our son when we fought, this time she tried to do it again after another argument (over nothing) and I said if you go I wont be here when you come back (was an empty threat) but then we had a huge massive argument and this is whats happened. Im 99.9% sure there isnt another man involved as far as I know shes been living at her moms for the last few weeks (I am still quite good friends with her brother). I would love to have my son living with me full time but the court will never side with me, they very rarely do go with the father so if anything it would just be visitation i would be filing for and no she has not filed for divorce, yet.

Update: July 05, 2009.
Shes 26, Im 24.

Update: July 05, 2009.
Yeah I have seriously considered it, I even mentioned it to her saying I just want to keep things civil for our sons sake and not involve the courts she then totally flipped out when I mentioned legal action and said shed fight me all the way.. that didnt go down too well so I have held off with it for the moment because I still want to try and work things out between us. Our house is only rented so its not like I have given her that much, just a place for her and our son to stay I took all my possessions apart from the washing machine, tv etc. At the back of my mind I cant help wanting to try and get us back together but she doesnt want to know so I just dont wanna go down that route yet.. although I probably should it has been a month. Its not that shes not letting me see him but she will only let me see him for 2 hours and staying 12 hours drive away out of state its not realistic time or money wise for me to travel 24 hour round trip + find a place to stay overnight (or sleep in the car) for just 2 hours a fortnight or whatever. I did also think seriously about moving back to my parents but seemed the only option at the time as I did not want to kick her and my son out on the streets... I keep sending her money to make sure my son is provided for, she only works part time as I was the provider she must be seriously struggling with money as we werent exactly rich when I was together.. now I have no idea how shes managing to pay the rent, bills and still feed my son thats my priority.