What is he housed in now?
Temps cool side warm side?
Belly heat?

"Some" males will stop eating during breeding season so I'm told, all of my males ate all through breeding season.

Moving them can trigger them to eat, had it happen to me last week when I sent a large female to a friends house 25 miles away, she had refused to eat for 5 months while breeding and didn't take and wouldn't eat "for me"
She ate for my friend the very night he took her in, lol.

Tubbing snakes, sounds horrible but I wouldn't keep them any other way

Good luck with him, he'll come around