Just make sure they arnt sharing a cage together. Rabbits and guinea pigs have very different dietary needs, that if messed up, can make them sick and/or kill them if not treated correctly. They can, however, share a free roam area together. Youll have to make sure the area is rabbit proof and piggy proof, and that the only food in the free roam area is hay. You also shouldnt let them stay together until your bunny is spayed so hormones dont take over her personality when it comes to the pair. Youll also have to watch them to make sure theres no accidental fights, as they both communicate differently. They can learn to understand one another, but theres always a chance of miscommunication between them. Rabbits also have strong back legs, and if the piggy gets in the way of a power kick, he could be very hurt

If you dont want the piggy anyway, i would take him back. A lot of rabbits are good solo as long as they have enough attention from their humans

Id keep them apart while you are out and about then (when your second hutch is fixed), just to avoid any accidental problems while you are away. Other than that, i think they should be fine. My youngest bun is friends with/slightly bonded to my boyfriends little sisters guinea pig since they had to babysit him for 2 weeks for us before. So its a pair that can work, but again, you gotta keep them separate for feeding and sleep

I agree. It isn’t advisable to house them together (for the reasons Mikey stated above). If you want to keep the guinea pig, I would recommend getting him his own cage/hutch. A companion piggy isn’t a bad idea, but you might be getting into more than you had originally bargained for (numbers-wise). If you wish for your bunny to possibly have a friend, she will need to be spayed first. Intact bunnies often fight with each other because of hormones and feeling territorial.