I've read all your posts, but not all the replies.
Your "partner" is a shithead. He's leaving you with zero security and your relationship doesn't sound stable, let alone good.
I understand that you don't have much money, and not enough to buy your own place - but you are very vulnerable, as you have realised.
With children, and the fact that he bought the place AFTER you got together (and after you had children?) then he's being very unfair and is not 100% committed to you or your kids (again obviously, as he's told you that YOU wanted them, indicating that he wasn't fussed/didn't want them)
I don't know what you do at this stage. He doesn't want to marry you, doesn't want to put you into a more secure position and seems rather iffy about parenting your DC - the obvious response would be to leave him and create your own stability, but that's already been tried and you had nothing, so unless you have some outside support, or have saved enough money to exit this trap, then I don't know what to suggest.
I'm so sorry you're in this position. Please try and get enough money together somehow to get away from him and create your own security.