I think I'm going to know my answer as I write this so here goes 
My boyfriend and I have been together almost three years, I have no kids, he has two. We don't live together (due to his housing benefit etc) as he is main carer for his children. Majority of our time has been great apart from the mum of the kids been vile and resulting in a community order so she can no longer contact me (which BF did absolutely nothing about - just let her carry on doing what she wanted for pretty much two years)
Anyway fast forward 3 years, he's been gifted enough money to be able to put enough money down for a mortgage, which is great for the kids (security etc). However, there has been no mention of me in any of it? Not me moving in... helping out... nothing.
He's mentioned before about his (not our) 5 year plan of me having enough money to put towards a 2nd home deposit in 5 years. My worry is I save all this money to put a deposit down, we buy a house and absolutely hate it because we've never lived together causing all sorts of problems selling etc.
Next issue.. I literally do not exist when the children are here. Unless I'm making dinner for everyone. He's not affectionate (very rare) and I feel we're becoming more like friends or a stand in nanny/cleaner. We aren't even in a relationship on facebook... in fact there's barely a mention of me on his fb.
And lastly... money. If we go out of family days/ shopping/ pub/ anything really... I am the one to pay. I don't think he does this on purpose, but he's the first one to mention if he's spent more than me on something. To the point I actually showed him my bank statement to prove the massive difference as he was feeling hard done by!
What would anyone else do in this position? I don't want to feel like I've wasted my life being treat like a doormat while he's setting up a cosy life for him and his children.
I'm so confused and lost about the direction in which my life (or ours as a family) is going 