We have a close friendship group, we have known each other for 20plus years. One of our friends has been married for 25, they have a teenage DD. Friends wife has always been the Stronger one in the relationship (friend is the least confrontational person ever if he wasn't a friend we'd call him a doormat). Things have been slowly getting worse for them since having DD ( this was difficult needing ivf). Recently friend confided in DH who was friends old school friend, they hadn't had sex for over 10 years. At get togethers there's now nearly always an argument with Wife storming off usually with DD in tow ( we kind of dread inviting them round now). The wife refuses to work (gave up well before got pregnant) despite friend asking her to. Apparent she has been throwing any birthday presents to the side with sneering remarks for years, constantly criticising him in front of friends and basically living a desperate life moaning every time friend buys something.Anyway we have all hinted he should leave for his sake and DDs. Friend has finally decided he can't take it any more but is worried about the practicalities. He obviously pays for everything. They own house with mortgage as tenants in common. How much of his salary is he likely to keep after maintenance and what about house? He would obviously be happy to keep supporting DD but needs money to live off. Wife has said she will take him to the cleaners if he leaves. In the short term he could move in with paents