Mid 20s-30s chubby girls are my kryptonite

I feel like I've been single for too long. I have seen my friends find amazing partners and I'm convinced that I'm the problem. I've finally accepted that I'm in love with chubby women. Every time I date someone outside of my type, I inevitably realize that I'm not attracted to them enough to have a successful relationship. In the last 2 months, I matched with 2 women, only to have them both ghost after telling them that I love chubby girls. I have started to develop this fear that if I express this to a woman I'm in a relationship with, they will think I'm fetishizing them and leave me. What's the best way to approach this topic? Do I tell women before asking them on a date or do I wait until we are in a long term relationship? I could really use some advice.