It sucks that it was a catfish situation. should you walk away, probably. should you expose him for what he is, debatable. See the best and worst thing about the internet is you can be anyone you want to be and most people would never know. Could you ever get past this and be friends on a intellectual level. that i can't answer for you because i personally couldn't when someone tried to catfish me and i found them out. Keep us informed on what you decide.