3.When he gives you small impulses.
Between humans, we do not do that. Or, we do it and it is at the risk of getting very bad. Moreover, to give oneself headbutts is nothing cordial between people. But for cats, it’s a big sign of affection. It serves them to present their feelings and when they rub their heads against you, it is as if they were trying to leave traces of their scent on you to prove to you that they are happy whether you are their master or their mistress.