Boyfriend and Porn

So my boyfriend and I have been dating for 3 years. Recently I have noticed that since he’s tired a lot he relies on porn a lot. I understand if I’m not around or at work for him to relieve himself but there are times he will as soon as I leave or a few times he has locked the bathroom door and done it. He says that it’s less work and that he’s too tired for sex, but I have tried to turn him on and it won’t work. I know he’s watched porn before, but he and I would have sex a lot. I’m not sure if I am overreacting and I know I am slightly insecure, so I’m asking for advice to help with being okay with it. Or if what he’s doing is normal?

Update: he just tried to break up with me..