When I miss someone very much, I dare not send him a message! what to do…

What is your relationship with him? If you have a secret love, then talk to people who are close to him and he will feel better. If you are in love, then talk to him shamelessly. You can also use the previous method. If you break up, then talk to him. After all, if you are in love, you will still have some feelings. He should not ignore you or make cold remarks to you