How to deal with Aquarius man's cheap mouth

Actually, you really don't have to deal with it. Aquarius people are harmless, schemers, and very much in line with your preferences. Just lie to him. If it doesn't conform to silence, Aquarius people are smart and know other people's psychological thoughts. So don't worry too much. He thinks he has a good relationship with you, so he will talk nonsense with you, otherwise he will leave you alone.