I am fully awareThe part that I played in the demise of our marriage I do feel responsible for the fact that I did not give her the time that I should've I did not give her the love that I should of and for this I have nothing but regret.
OK. How about this. What do you think SHE contributed to the downfall of your marriage? You are not completely responsible. As for your regret, if you tried to build a house with no nails and it fell apart, would you blame yourself? You did what you thought was best. You didnt have the tools to realize the error in your ways. Now you know, and you can do better next time.

I guess I am still at the point where in her mind it is over but I still do not want it to be over I'm still yet to accept it is over and I want to believe that there has to be some hope that there could be some possibility.
There is hope. She may change her mind SOMEDAY. But you cant live your life expecting that she does. Or waiting for it to happen. You cannot put YOUR life on hold waiting to be her backup plan.

That we might find a way to reconcile our differences perhaps this is because we are getting along so well perhaps this is because we do things together perhaps it's because When I say to her I am worried and scared about the sale of the house that she turns round and says that we will deal with it when and IF it happens.
STOP LISTENING TO EVERY F'ING WORD SHE SAYS. STOP TELLING HER YOURE WORRIED. SHE IS NOT YOUR FRIEND RIGHT NOW.

Do I think I stand any more chance of getting my marriage back honestly no I don't but I do have to try and I do have to reach the point where I can look at myself in the mirror and say that I did everything that I could do to try and save it to try make it better right now am I there I don't think so
You already KNOW the path. You already know what you need to do. You just dont want to because it seems counterintuitive. What do you have to lose, right now?

How will I cope the day she tells me that she's going or the day that the house sells and she goes on her way ....how I don't know I just pray that between now and then I will find some strength.
Ghost. Shes ALREADY gone. There is no "day". You cope by following the path laid out in front of you. You work on detaching. You get your own life. Yeah, it'll hurt....but it will hurt a lot less than anything that has already happened.

Day by day .....how do I get myself to the point where I let go and accept it is over

Three months nearly four and I still cannot imagine her not being there I am crying uncontrollably this is not right surely.

How do I [censored] do this ....

Is this dropping the rope or is that something different

Please help me,to get through this
We ARE. We're leading you right to f'ing water, but we cannot make you drink. You have to actually do that by yourself. Theres really no more any of us can say to you that hasnt already been said. It's time to DO. IT.