Sorry but this is the reason it should never start, The poor guy doesn't know he can't be on your new furniture, they don't know that nor do they care bc he was once allowed on, now you say he can't
, it's much too confusing for them. Since he's already allowed on the furniture why not let him have his own chair :D. Sorry don't know how you're gonna break this habit otherthen constantly saying "OFF" and perhaps having a spray bottle handy but as I said he's not gonna have a clue why one day he can be on and now can't. You're giving mixed messages, sooorry!!