Thanks Busto - You're still hanging in there for me!
Your feedback really opened my eyes to things i had not thought about in my behaviour.
I went to the link and did a lot of reading and thinking.
Aside from anything else that i learnt about, I think that the basic advice to
"Take his actions at face value or ask him what he is thinking/feeling"
is going to be part of a big step forward for me.
Also, reading the MB material makes me think that stbx has been given a lot of this info by OW. I recognise a lot of key words that he's been using over the last few months. But there i go again trying to deduce his motives and state of mind!