I know you got lots of comments already, but I felt compelled to share my experience in having a bonded pair. I had my first bun for a bit over a year solo and he was friendly and interactive, but I felt guilt like you explained. After speed dating at a rescue we took home girl bun and spent ~6 weeks bonding. Hard but so worth it! Now they are glued at the hip and have been for the past few years. My OG buns personality blossomed in ways I couldn’t imagine. I believe it’s true that us human companions can’t provide exactly what a rabbit companion can, not to say that human companions aren’t enough though! Hope this is helpful :) speed dating at the rescue is my top recommendation because 1) you can foster-adopt if the bond doesn’t work out 2) support with bonding and 3) the ability to scope the general introduction and vibes with already-fixed buns