What is a prudent?

My ex boyfriend and I broke this week he made a big mistake went out got drunk got arrested he begged for me back I won't take him back. This am he messaged me on fb none of which it made any sense. I replied "must be drinking" and few one word answers. He screen shotted the short convo and posted to his fb wall? Then called me a prudent? What is that! Very immature
What is a prudent?
Add Opinion