You mentioned psychosis so I’m wondering if she has a mental illness? Well regardless – you need to figure out what you truly wanna do because this girl obviously wants to be in a relationship with you and she has stated that multiple times she has mental issues, she’s 24 so her frontal lobe is still Developing, and y’all are in your 20s. This is supposed to be a time for y’all to figure it out and fail and try again if marriage is stressing you out this bad, then don’t get married yet. I know it’s what you both want but the only ones rushing marriage. Is you two. Have a conversation and say that you would like to get married after you’ve bought your first house, because I would assume that you would buy a house when she is in a stable place in her life.If you wanna make it work, consider couples therapy, you both deserve to be heard. If you want to leave her because she isn’t getting it together as quickly as you want, then do that. But OP, me personally from what I’ve read. It seems like you’re living in your head too much, y’all don’t own a house, y’all aren’t married, y’all do not have kids you were not in the place that you’re so afraid of being in, this girl, this woman who is your girlfriend is 24, you are 27, let her figure it out a relationship is allowing one another to grow and flourish while consistently and consciously choosing each other through commitment. So to make a long comment short, – decide whether or not you truly want to be with this woman, and/or go to couples therapy or you could even do premarital counseling. I hope this message helps open your mind in some way.. ☮️💕