I am questioning the same thing with my cat. But only she is female and seems to be in love with my husband.
He has caught her mimicking a couple of my behaviors with him such as kissing him(putting her lips to his but no licking) and nibbling his ear(that one freaked him out).
she also purrs like a motorboat for him and gives me the look if i walk into the room while hes petting her alone.
If I show affection to my husband she gets jealous when I walk out and turns away from my husband.