Hi, welcome to the forum! Glad you joined!
he was always really mean.
To me, this could be an excellent reason to get rid of him.
now, i gave him 2 hens and its been like a month since i got them. i placed 14 eggs in the incubator and only half were fertile, then i saw him actually breeding with one of the hens and he could not do it because he fell over. what should i do? should i add more hens or get another rooster?
I don't know your goals or why you are doing things this way. That is your business and why it has to be your decision.
Can you tell if all of the chicks you hatched were from the same hen? If so the other may be infertile. You may be able to tell the difference in eggshell color, shape, or shade or maybe by the color of the chicks' down or other characteristics.
Infertility could come from different things. It could be a problem with the hen's internal workings, maybe you need to trim some feathers around the vent, or maybe she won't let that boy mate with her.
Consider the "internal workings" some kind of birth defect. Sometimes the feathers on some chickens are so thick they hinder the boy hitting the target. Some breeders of show birds have chickens with feathers so thick they have to trim the boy and girl around the vent to get them out of the way pf a successful mating. If that hen is dominant and he has not yet matured enough she may not let him mate her.
Not all eggs fail to develop because they are infertile. If the eggs are stored too long before incubation begin or get too hot or too cold the embryo may die.
I don't know what your actual problem is. There are other things that could cause it. I don't know what you need to do to meet your goals.
Good luck!
