Opinion

So husband and i were cooking last night and he gets a phone notification and shows me...his ex sent him a friend request on fb. Now i am not petty. I don’t mind him having females on his fb BUT HER. I’m not ok with he deleted it of course but like why would she think thats ok? We’ve been married 11 years together 12 and BOOM out of no where she sends him a request? Should I message her and ask her why she send him one?