What are the manifestations of men's jealousy?

First of all, he will behave calmly, but he is not so enthusiastic about me. When you don't talk to him, you may not really find him jealous. When you talk to him, he is no different from usual. However, when you need his help, he is not so enthusiastic. For example, if you ask him to help you with something, he says he will help you with it. However, he didn't act at all because he was jealous.

Secondly, when I say that a boy is not bad. He will say that that boy is not good, and if I continue to praise that boy, he will not be very willing to talk to me again. If I don't praise that boy, he will also judge me from his own point of view, or tell me a big story. On the surface, it sounds good, saying that he is also an objective evaluation. In fact, his jealousy has turned over. In fact, when I say hello to other boys, he will ask if he has much contact with that boy. If I say that the relationship is good, then he should be jealous of others again.