Why doesn't Crowfeather like Breezepelt?

Answer 1

I think it's because he still has "true passion" for Leafpool, and because of that he can't just be grateful and appreciate what he has.

Edit: I think it really has more to do with the fact that love, in general, is equatable to pain for Crowfeather. Feathertail was the first cat he ever really opened up to, and she died before they could really get close; he took that very hard. Then came Leafpool, who brought with her, instead of happiness, another dosage of anguish and misery. He only mated with Nightcloud so that his Clan would trust him again; he doesn't really love her, because he won't let himself (since he doesn't want to be hurt again). For that reason, he is resentful toward her and their kit, Breezepelt; he still thinks of what "should have been" (with Feathertail or even Leafpool) and can't stand the fact that he's going to have to live the way he does now, pretending to care about Nightcloud (and by default Breezepelt).

Answer 2

Crowfeather is distant from Breezepelt because of Breezepelt's loyalty to the Dark Forest and his actions that caused harm to his clanmates. Crowfeather values loyalty to ThunderClan above all else and struggles to reconcile Breezepelt's choices with his own principles.