Thank you GoatGal, I am listening!! I skyped him today sounding cheerful, my normal self to ask him a few general things about work on our house, this was a few hours after finding out that he was with the original OW last week and was trying to start up the relationship again.
Anyway he said he would be home the last week in July, for about a week, i had been thinking of asking him not to come home until he 'knew what he wanted' but in the end i sounded happy that we would be seeing him and he sounded happy to be arranging another trip.
So i have a few weeks to get my act together and 'be happy, moving on'.
I live in a damp cottage, a little isolated, with no curtains (only cows can look in) and I also relayed information about getting logs (no central heating) in the winter, and mentioned that i might look into getting an alarm because it could be a bit scary when the kids were out and I was alone. And yes, this just made him feel more guilty (OW advised him that money would cover all these issues for his W and kids when he told her that he felt bad).
I will be re-reading your advice above when he comes home so that i am ready!!