i can understand that..you might want to inform him he is not required to remove his shirt, i go to the gym 3 times a week(working my way back up to daily) not once have i seen a guy in there with their shirt off & all gyms have restrooms or changing rooms if not both, or he can come dressed to work out already. a relationship isn't about controlling people and telling them what they can and cannot do..he has the option on going with you..if he doesn't want to go.he has no right hindering you whatsoever! it is admirable that you care about your fitness and well being and he should be supporting you in that endeavor..its just that simple.