That is one of the signs that's he is interested. Both of them should start getting thier breeding colors, some chasing also be ready for a fight. Females won't breed with male's they can beat up.
This is Jill a female I had in her breeding colors
See also how her belly is nice and fat, filled with eggs
This is Jill a female I had in her breeding colors

See also how her belly is nice and fat, filled with eggs