Welcome, Beckie,
I’m afraid I can’t see your pix of Vettel, If you go to the Tech Forum, you’ll find instructions on how to post pix inside your post, which may help.
You need to wait for 4 full weeks after his neuter before he can come into contact with a female, because his hormones will have one last surge before they are ineffectual. Then he will be ready to date.
Circling your boyfriend, btw, is his amorous nature due to his hormones now, and it may stop or may not. Doesn’t mean he doesn’t love you too!
Bunnies don’t need to be restricted to breed or size to bond, but a large bunny that’s aggressive has potential to be a bit more harmful if they don’t get along. A bunny will select another that they have a possible future with if you take them on “dates” – ie. bring your bunny to a shelter with other bunnies, and let them be introduced in a controlled setting there. The biggest mistake is when us slaves fall for a second cute bunny, and brings it home only to find their first bunny hates it. Some bunnies will be very happy with another they meet that is different in size and type, but you will have years of contentment in your home if they start out liking each other.