I have 2 male parakeets right now. They have been together for about 3 months now. I got one like 2 months before the other. If I added a female would they fight over her? Would one just breed? Would the other male have to be removed?

It really depends what species you have - 'parakeet' is a bit generic and doens't narrow it down much. I would imagine one male might well pair with the female, but I suggest you speak to a professional breeder for advice.