Evening Ladies,
Corine - you need to think about YOU. And if that means that your marriage is beyond the point of no return, then I think you need to sort things out iyswim. If he realises that it's over too, then one would hope that he is grown up enough to let both you and himself move on to the next stage...
And no, you're not being selfish btw! When the big ones were smaller and I had a night or two to myself, I revelled in it also. There is absolutely no denying that the first few months of weekend/week long separations are incredibly emotionally draining, but that's because (imo) that it's all still raw and new. Once the kids and I had settled into our new 'life' and routines, the breaks were welcome (if only so I could have a glass or 6 with my non parenty friends and not need to deal with children while marginally overhung.....) 
Paul ^^see above para! And also - I know that it's easier said than done (but I have done the done bit too) however, your DCs are your main priority and you have to detach yourself from him and treat dealings as one might in business. If he's being an arse, simply answer any questions succinctly. If he continues you ignore your proposals and suggestions, if it was me I would not answer anything further from him until previous questions etc had been addressed. So long as you remain straight and decent, then he will have no reason to take issue.
Dumps glad to hear you had a lovely (if wet and windy) weekend in Glasgow. Beach was lovely, thank you, slightly cloudy but it's much nicer than glaring sunshine tbh.
Joely/ten/Catapult what's news with you three lovelies?