Milk snake nose rubbing?

[Ascended]

He is a 3 year old Honduran milk snake. He is fed a large mouse every other week and has been eating that way for a year now.

Might be his is hungry. He is bigger, and older now. Maybe the same size and frequency of food that he had when smaller is not enough for ever. Maybe try weekly feeds or a larger meal.
Also maybe check your temperatures with gun.

In my own personal experience, milk snakes don't exabit that kind if breeding behaviour, (nose rubbing) and little breeding behaviour if not cooled.
That's just me. Other members will have other advice