in chapter 4 of sign of the moon. i think if jayfeather can have a mate it would be halfmoon but i like briarlight more and she's the most likely that he would fall in love with after halfmoon. and for the people that think he loves cinderheart or poppyfrost he don't because he knows his brother lionblaze loves ciderheart, and berrynose love poppyfrost they have KITS