oh no you are not coming across as self pitying at all.
I had a very similar situation, i couldn't comprehend how my ex could do all of this to our children and our family!!
3 and a bit years down the line its interesting how things have worked out. we both have our own homes, not as big and swanky as the former marital home but nice houses all of same, and best of all they are happy homes, sadly something the marital home wasn't.
i am much more involved in my kids life and thats a good thing.
i have worked hard to build up a great social life (and have time to enjoy it as we co parent)
my ex and i work tirelessly to get along and do the best for our kids. This has been a massive help.
There have been downsides of course, missing out on family occasions and such like as a unit, we don't have quite as much money each as we are both running our own houses, but we are by no means hard up, the kids have taken this on the chin,
'dad can we go disney world florida?
'no chance, we can't afford it'
'ok, can we go to euro disney then?'
'probably'
'cool'
its hardly a deprived childhood
I guess i'm trying to say that things do work out and the result will not be as bleak as you see it right now. Like me, and many others you are in a situation not of your own choosing (and i was bloody furious and sad about that) But these are the cards you have been dealt, how you play em is up to you! chin up.x