Ideally, I'd get 2 spayed female bunnies, one for each boy.

Otherwise the boy without a girlfriend is going to be jealous and there's no telling how he might react.....He could either fight the other male for the female, he could possibly go after the female and fight with her, or he could get depressed or destructive and angry (it's kind of similar to someone on the outside watching the "in" group be cool and have fun, but not being able to join them).

It won't matter if you have the boys in 2 diff. cages, they can still hear, see and smell each other. And a single moment of carelessness can create a dangerous situation. In addition, chances are you will end up spending more time with the couple (especially when the female first comes home) and the 3rd bunny will be ignored. Remember bunnies are very social and if they do not have one of their own kind as a friend, they need a lot of attention from their human.

You should go to www.rabbit.org and read up on bonding. You might want to try to stick it out keeping the boys together for a bit longer, but again, this pairing of 2 boys together is usually the least successful match.

The key to a successful pairing is simple but not well-known....... It is preferable that you let your boy pick out his new wife! Don't just bring home any old female as you run a risk that they both want to be the boss bunny and therefore will never get along. Then you'll have yet another problem on your hands.

The chances for a succesful bonding will increase dramatically if they can meet somewhere without distractions of noise, other rabbits in the immediate area and especially when they are not in their own space/house/cage. Because buns are territorial, chances are if you bring in a new rabbit, the bunny who "owns" the space may become aggressive in order to protect HIS cage/room, whatever. So introductions in neutral space are key. Each introduction will be different depending on both rabbits personality....again I strongly recommend that you go rabbit.org and read up on introductions and bonding. Good luck!