That's okay :) I got two males in 1 gallon tanks, but trust me it is okay for some bettas as there are bettas (I have them!) who hate large spaces, but I have most in larger containers or tanks. If your guy is like my Spartan you will have no problem! Expect some chasing, a little nipping from him if anything, then afterwards it'll be fine. If he doesn't stop chasing, then there is a problem. Good luck!
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.