I found a cheat to date him (And every other cat who's doesn't like you) even as a she-cat you make a save file then add your desired mate's name in the brackets to the right to the text in your gender
For example, here's an extract of my save file ( desired mate's name HERE)
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V1.15.1/1/Dark/sky/412/17/9/15/14/RiverClan/She-cat/Wavefront/ (I deleted the rest of the info because I don't really feel good about others being able to play as a copy of my cat)