If I like it, he will delete it.

If you praise him, he will cut the talk. Generally, this can only explain two reasons. One is that he doesn't want others to know about your relationship, and he doesn't want others to see this interaction between you two. Another reason is that he compared the plan with you, and when he saw you praising his conversation, he felt a little uncomfortable, so he simply deleted it. Anyway, you'd better keep a certain distance from him.