Why is urinating on the sofa again

Hi all,
My male rabbit has just started urinating on the sofa again and I don't understand why? He stopped doing this about 9 months ago when we got our female rabbit but sadly we had to have her put down a month ago, today all of a sudden his started again and I don't understand why
Please help

I've just posted on a very similar subject. Does he urinate only when your on the sofa with him or at any time? Is he neutered?

He does when I'm out the room or doing something else, I don't understand why his started this again? Yea his neutered

Anyone have any ideas why he might be doing this???