Bondage

Hiya plz can I have some honest advice and peoples opinions x so I have been married to my partner for 9 years now and have 5 beautiful children with them x lately my health has gotten worse and I can’t have sex much and my tastes have changed x the problem is my partner lives bondage and rough sex/foreplay and has started chatting to people on a bondage group on Facebook x they send pics and txts to each other x the argument we’re having is that they have every right to talk to who ever they want as long as there’s no cheating (there words not mine) to me sending pics and even talking about what they wanna do to each other is still cheating x he says I miss me time and to talk to grown ups about things I like and that I enjoy x I love him but I can’t sit back and watch this x