Feeling useless angry and lost

Stacey
So me and my SO have been TTC for around 7-8 months now with no luck. My phone keeps crapping itself so I asked my SO if I could borrow his phone to have a look and price some new phones. While I was typing into a the search bar it come up with all these porn sites. I clicked to have a look at his recent history and he has been watching porn very very regularly during the time that we have been TTC. I asked him about it and he just couldn't give me an answer. When I asked him if he still wanted kids with me he said he does so much. 
I've left the house to be alone for awhile because I'm so upset by it. I doubt he would be stressed from TTC. I don't tell him when I'm fertile or when I'm using OPKs or anything like that. We just have sex at least every 2-3 days. It's always something different so he shouldn't be getting bored, we always have sex in different positions and places and we are always getting new outfits and toys for the bedroom. 
I'm feeling pretty useless not being able to get pregnant and now I feel so upset and cranky that I'm not enough. I don't care if he watches porn when I'm on my period or when I don't feel like having sex. It's just we are trying for a baby and I wonder why he needs to watch porn when we have sex so often.