This is on behalf of my OH who knows i sit next to him on the sofa reading the AIUB's every evening. He's asked me to ask you all this ..... warning: its rambling and about the building trade 
Background: OH is an experienced and efficient builder (part self employed) who untill April worked for company L, under a manager named Z. OH hated Z, and fell out with him loads of times. OH was highly valued by Z and was the only one on site who Z trod on eggshells with. Z had alot of clout and hired and fired at will. Having worked on that site for a long while OH became very pally with the other builders (those who Z didnt fire after the first week), pariculally Y, who is an older man and a slower bicklayer but is a genuinely nice guy and is good with organisation/paper work ect.
Y eventually got fired by Z and burned his bridges. Shortly afterwards OH decided he'd had enough of Z and left company L in search of less stress and better money (on good terms with Z tho'. Didnt want to burn his bridges ect.)
OH and Y kept in touch, got together, found a labourer and a young brickie to join them, made up a gang and have been working together since April as a team. They are about to finish their first project together (not without its stresses) and have a new one to start on Thursday. They are friends and although going it alone is stressful they get along well.
They heard recently through the grapevine that Z has been promoted to even greater heights within company L. More clout, the power to decide on wages ect.
Now ...... the point. This evening OH has had a call from Z. Z has made him a really good job offer (back with company L) with a raise of 50% on what he was earning with them before, and what he's currently earning going it alone with Y and the gang. Plus other perks. He knows he would be looked after by Z and could be in line for a promotion back there. OH would not have to see Z every day like before if he went back, as Z is now mainly office based. So less stress, more money. Steady income.
The thing is we know that things would be almost impossible for Y if OH left. It would cost the gang the project they have just secured, and possibly any projects in the near future. Y is struggling financialy but so are we. He feels bad at leaving Y in the lurch - there's no way Z would employ Y again. That was made clear. We need the money. But OH needs to be able to sleep at night. I dont know what to say tbh.
WWYD?
Thank you for ploughing through this.