Help me with my negative bf

We want to move out by the end of the year but he keeps saying we need to be realistic and we’ll only have 100k saved up and will only afford a studio in Warsaw. He’s saying I’m delusional and think money will fall from the sky but Ik I’ll manifest a way to live in a bigger more comfortable place cuz that’s what we deserve. How can I keep up my positive mindset if he’s being so negative all the time it’s like he has a lack mentality and he gets mad so easily cuz he’s stressed out about it. It’s starting to really annoy me.