Unsatisfied

Is it possible for men stamina to get worse? I mean I know it is but I’ve been in a relationship with my guy for roughly 15 years and he just don’t seem like he can last anymore and I feel like sex is a job… I’ve tried talking to him and he says it’s not his fault because we don’t have sex that often and I explain that it’s because it’s a waste of my time when I’m left to finish myself off and around and around we go… I’ve also tried toys and some toys get me off well just my wand all others do nothing for me… I’ve also been having off the wall fantasies and I feel like me and his sex life is vanilla I want to be dominated and just some more rough stuff but he won’t even try it ugh what do I do…..