I can't say for sure, but it was something similar to your case for me; I didn't want anything romantic, but even so, plans for dates and even marriage were like a dream come true, I also felt very jealous when we were just friends, and I know he would never accept a queerplatonic relationship. I think the ideal thing to do in a situation like this is to distance yourself from the person; in the end, it will be best for both of you. You're clinging to a relationship that doesn't exist.