Dealing with the Loss of half a Bonded Pair

Tonight I had to put down my female Roxy due to Malo. I'm worried my male will be lonely and get depressed. Anyone who has been through this and can give me some of what I can expect from Viper would be greatly appreciated.

Also is it worth trying to introduce a new friend for him or will he be alright on his own? He is neutered if that makes a difference. It's been a hard night and I just want to make sure Viper will be alright.