Guys over 30, opinion please?

well i think (coming from a guy) the only thing you can do is ask him to respect you and tell you if he is feeling something for someone else. people change partners all the time and it is there decision to do so, it might not be the right choice but it happens. it will just run him farther away from you if you start to be a controlling naggy girlfriend. i believe there is nothing that you can really do in this decision (sorry to say) because in the end men will be men.