He keeps everything vague. Why?

“Maybe” and “we'll see” leave possibilities open. They do not establish an agreed plan, but they also cannot prove that uncertainty is a deliberate strategy. The unresolved part can be named without deciding why it remains unresolved.

A specific proposal gives the conversation something answerable. If you still cannot arrange a time, that is enough information to make your own plans; you do not have to provoke a more definite response through a guessing game.