I’m not saying that folks shouldn’t bond, but having rabbits for 40 yrs, I don’t think every rabbit is necessarily happier with a “mate”. Just calling it like I see it.
The best bonds in my years of experience were spayed sisters, unspayed females who were friends in an outdoor pen from a young age and a spayed female with an unspayed female, again in an outside pen.
Not saying that is true across he board, just reporting my own experience.
Males LOVE attention from females, but the gals can get testy with a male too when they are tired of having him a round. Any two rabbits are likely to have a scuffle from time to time, but overall my female pairs were the most happy together.
I have also had many rabbits live long, happy lives without a buddy as members of a human family.
I would suggest, for their own health that females be spayed. It can lengthen their lives. I have had unspayed females live to 11 years old, but they were the exception rather than the rule.
There are never any guarantees with any bond, enter at your own risk?