He won British, Commonwealth, and European Titles - can't be too upset with that. Even challenged for a World Title too.
Got knocked out by a Mexican in the first round and then retires. Fair enough. Done well with his career, could bang but couldn't take a punch.
Likewise, Johnny Nelson jinxed him and gave him his legacy at the same time. Don't know what's worse Nelson saying that or saying Usyk is an average southpaw lol.
Johnny Nelson will be absolutely devastated. On a serious note though, well done to him on a good career. As has already been said... winning British, Commonwealth and European titles + challenging for World Honours are fantastic achievements. Good luck to him.