A woman called me with this exact question since she knew I was a member of the House Rabbit society.
You need to watch this. Rabbits can get depressed after their buddy dies. Unfortunately, and I do not mean to scare you, but I called a more experienced member who told me rabbits can die from grief.
A very good and humane breeder had a pair who would break into each others cages. They would not breed with any other rabbits. They loved each other. They got too old to breed so she put them together to live out their lives. He died at age 11 she lasted 2 more months passing away at 13.
So while it might not be this serious do not take their emotions lightly. You might find a day off and take your bun to see other rabbits but spend the day with him and the potential buddies. They usually recover but it is emotionally trying.
Please do not let this post scare you but these are the words of a House Rabbit Society sanctuary manager and a respected breeder.
And yes they can feel abandoned. My rabbit had to spend a week in boarding because toxic chemicals were being used to refinish our bathroom. She stopped eating and the techs had to force feed her because she would not eat.
You could try looking for a sprayed female on craigslist or hoobly. Sometimes you can get one from 4H club members who are soon going off to college where dorms and landlords do not allow pets. Usually they have an experienced adult teacher who can find a well behaved bun who needs a home.
Hope this helps.