OP, I understand your upset but you're pinning yourself down now, giving in to the sunk costs fallacy. By which I mean, well you've waited this long - a tiny bit more can't hurt, can it?
Only it can. Yes it bloody well can. You've had your eyes opened even more than they were. You've had validation from every person on this thread and you are not a stupid woman. You know that he is lying to you, it's just that your hope is trying so hard to triumph over this and still win the day.
When you said, "Even if he did propose will I always feel like he never really wanted me and I just had to push for it or he gave in for an easy life.", that's when you knew deep down that it's over. He knew how much you wanted this and he deprived you of it. You wouldn't have done that to him. Your partnership is unbalanced, unequal and you know it.
Spend this last day of your holiday mentally saying goodbye to him and when you get back to his mother's house, don't unpack. Add more stuff and go to your own parents' house for a bit. It cannot be worse than this push me-pull you crap that he's been making you complicit in.
I don't know if you will have children or not but I do know (and so do you) that you will never have them with this man. He has already primed you so effectively, you would forever be waiting for a proposal that didn't appear and, as you said, even if it did - it would be tainted.
You deserve better; go out there and get it. Give your mum a ring and let her know that you're coming home for a while... I bet she'd be relieved. I would if it would be my daughter in your position.
He's taken 13 years. He's not to have any more of your precious time. 