That's it in a nutshell.
H moved out in July straight into arms of OW. Now he's back much against my will. They were the happiest few weeks of my life for years :(
But he says he's not going anywhere: 'It's his house too. WE can't afford for him to get his own place' yada yada.
Friends have offered me a room for a while, can I really leave 3 DCs - 18, 16, 11 - when it's likely because of the distances involved, work etc I wouldn't be able to see them more than once a week?
Just to be fair I did have a role to play in him leaving: had an EA, and yes i should have left before i stepped into that swamp, and no it's not an excuse, but see comment above about how unhappy my marriage has been for years