Bảo đảm rằng anh ấy có tình cảm với bạn. Trông xinh đẹp nhất. Cho anh ấy thấy bạn đang có khoảng thời gian tuyệt vời. Duy trì sự bận rộn.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Jealousy only works if the guy has feelings for you. If he's totally not interested, you'll have a very hard time making him jealous. The good news is, any guy you're dating or that you have dated is almost certainly interested in you, and the same can be said with guys that have been flirting with you. If you're not sure if a guy is into you, you can just try to make him jealous anyway.  Though it's impossible to know if he has feelings for you with 100% certainty without asking, there are many