Hi,
I’ve NC for this because I’ve posted some identifying details on here before and I’d be mortified if I was outed for this. 
I moved in with my partner a few months ago and we are both mid twenties and have been together for two years. We are very happy and never had a problem in our relationship. A week ago my phone was in another room so I picked up his phone and went to google something. Clearly he’d forgot to use private browsing because what I typed in happened to be the start of a porn website he’d viewed as it came up in the suggestions. I couldn’t help myself and had a scroll back in his internet history and I really wish I hadn’t as I could see that he’d visited a few porn sites the night before.
Our sex life could be better. We have sex once, maybe twice a week and that is mainly due to the fact that I have endometriosis and suffer a lot of bleeding and pain after sex. We’ve kind of got into a rut now where one of us doesn’t even try to instigate it. I have no problem with him watching porn and I know masturbation is perfectly natural but this has upset me so much. I got really upset and told him what had happened and he admitted to me that over the past few weeks he has been watching it once or twice a week in whilst he’s saying he’s in the shower.
I can’t get out of my head that he’s looking at other girls whilst I’m in the next room and he doesn’t even try to instigate sex with me on these times. I’d understand more if I was saying no and then he did this but that isn’t the case. Our sex life has just slowly dwindled because of my endo. He says he doesn’t know why he’s doing this, it’s nothing to do with our relationship and he thinks it’s a habit he’s formed living at his parents where if he wanted to masturbate he’d have to lock himself into the bathroom.
I don’t know what to do now. I think I’m being particularly over sensitive because I was already worried we weren’t having sex enough and my endometriosis is a big problem. I feel a bit disrespected but also like I’m massively overreacting. Maybe lockdown is just getting to me. Is this something all men do?