If you are talking about Betta splendens then the answer is if she doesn't come through with the whole breeding deal he will beat her up and kill her if she is not removed form the tank.
Females give birth and not males because the sperm in a males penis and when inserted in the vagina, the sperm travels to the egg which is inside a females body. ;) x!
Males are supposed to be gentleman and act like gentlemen! And when males get gifts for females that's like the right thing to do.! But females can get gifts for males too though.
Bettas are egglayers, not livebearers, so the female will not 'give birth'. Males and females should never be kept together due to aggression. If the female cannot see a male, most of the time she...