Should i retire after one brutal ko?

fight an mma fight about once a year.. i dont just train mma specifictly i train in the arts as individuals as whell.. record is 9-1. i won all 9 due to ko stoppage or sub but my last fight was brutally koed.. i was winning the fight up ontil the middle of the second when i landed an overhand right that rocked him, i back him against the cage and unleashed a lotta haymakers and i threw one fight shot that landed right on the chin of me.. next thing i new i was hearing it was 5 mins later.. he was ready to go i just got caulght, and my trained says its time to retire... what do you think?