Hi YG - just found this thread and so sorry things have been so horrendous for you.
Really difficult - in a way your dh reminds me of me..! In that this is just the sort of tangle I'd be likely to get myself into - not being able to shake off an ex and not wanting to upset them by being rude and just saying f* off...and I know I'd be likely to hide it from dp so as not to upset her - but it wouldn't mean anything was going on at all. But I'd hate to think it would in any way jeopardise what I had with dp (being stupid and all...)
The toys thing is really difficult - I work full-time and often come home to the house looking like a toy bombsite and sometimes it irritates me, but then it only takes a second to remember and realise just how bloody hard it is entertaining 2 kids all day... Our ds1 is 3.5 and there's no way he'd tidy up as he went along - and now with ds2 creating chaos it's impossible anyway. Does your dh have the kids on his own at all? I must admit I rarely do, but when I do it's a good reminder... Maybe it's time to treat yourself to a half day shopping on your own, or day out with a friend - tell your dh you need a bit of time on your own and leave him to it for a bit??
Anyway, good luck and I really hope you get through this sticky patch.