He sends me a blank message from time to time. What do you mean?

This is well-intentioned harassment, just looking at what you are doing.

He wants to contact you, he wants to send you a message, and he is afraid that you will not reply to the message, so he sends you a blank message to harass you.

When you see a blank message, you must be confused and will naturally reply to his message.

He wanted to get close to you, but he didn't say.

If she is your ordinary friend, she is interested in you.

If he is your boyfriend, he misses you.