Rabbits are herd animals, it’s built into them. Without at least one partner they will soon become unhappy. In the wild, rabbits have to be constantly on the lookout for predators and will feel very vulnerable on their own. Domestic rabbits are the exact same, even if they are in a safe run they’ll still be anxious if living on their own. They will also get lonely without someone to talk to and cuddle up to at night.
Rabbits need other rabbits to converse with. You can try as hard as you want, but us humans will never be able to fulfill all of a rabbit’s social needs, and we don’t yet understand the intricacies of rabbit communication. Animals need members of their own kind to talk to throughout their lives.
Rabbit need companions in order to be happy
There is little to no difference in the upkeep effort between one and two rabbits. You’ll want to clear them out as frequently as you would with one rabbit, and you’ll need to make the same amount of feeding trips (twice a day). Overall, it is best to get two rabbits, if not for you then at least for your rabbit’s sake.