What would you do if...

What would you do if your man couldn’t stay hard during sex like 9 times out of 10 (been going on for over a year) and you have a feeling they have a porn/masturbating problem, because you knew they had one a year before, but now they promise they’ve stopped for half a year? And also they refuse to see a doctor? How would you go about this issue?

*and they’re not on any meds