Hellllpppp nursing sleep association

My 8 month old relies on the boob to fall asleep and ever since he was a newborn has fallen asleep while nursing. I don’t think there’s a self-soothing cell in his body and now that we’re 8 months old the comfort nursing is driving me crazy. It’s fine when he’s eating, but when he’s nursing for comfort it makes my skin crawl and it now hurts since he has teeth. I don’t want to give up breastfeeding (my goal was to get to a year), but I would really like to just cut down on the comfort nursing. My fiancè can sometimes calm him down and get him back to sleep but not always & LO goes into full blown panic mode if we let him cry for a few minutes. Any tips?