Help separated buns

Hi all
Was wondering I have had to seperate my buns because the female keeps humping my boy and he has nipped her twice. U has bonded them about 6 months ago and the get on 80% of the time. But just recently I had caught her humping him a few times and he he had bit her the first time on the back don't know way happen as they were living outside. So I brought them both in to keep a closer eye on them. After 2 weeks of being inside he had bit her again on the flower this time. Bur wat is more annoy is I don't know why as it was web I was sleeping. So I hav had to separate them as I don't want her hurt anymore. Do u think I will ever be able to put them back together?
Thanks leah

Hi, firstly, are they both neutered? Also, throughout the day, how much space and exercise do they have? I have a similar situarion with two buns at the moment. They were happily bonded till their long journey here which seems to have caused stress and they have fallen out.

They have a large dog crate the size of a great Dane and half of a large room penned off which they got all day. I would put both in the large crate at bed time 10pm and let them back out at 7am the next day. I have the separated just now. Both have been neutered. They seem more content separated. Should I keep them like this and just supervise play time or do u think through time I may be able to put them back together?
Thanks Leah