Is he telling the truth or lying??? please help

So quite a bit of months ago I found out my bf watched porn. Just porn right? But it got to me. I told him to please stop and admitted I was insecure and he promised he would stop. He said he has a high sex drive and I knew that was true, we had sex a lot. Later he got a new phone but kept the old one because he said there was stuff on there that he hadn't transfered to his new phone yet, for months I kept trust in my bf that he really had stopped watching porn. But as time went on, he started wanting to have sex less and less. It really got me down because I also have a high sex drive and he knows this. We'd have sex maybe 2-3 times a month every month, if I was lucky. When I talked to him about it he said he was just tired a lot from work, understandable. But it wasn't enough sex for me and the passion from him seemed to be gone. Fast toward some months to tonight. I was searching for my birth control pills in some drawers and I moved a paper out of the way and saw my bf's old phone sitting under it. I thought it was sketchy and I couldn't help myself. I looked on the phone and saw a youtube page tab and a porn page tab was open. I went into the internet history and saw sooooo much porn. He watched porn every. Single. Day. My heart dropped. I felt like throwing up. I confronted him about it, waking him up from bed, and I asked "Why?! Why do you still watch porn?" And he said "idk" and stared off into space, maybe looking for an excuse. I said "I never masterbate to the thought of other guys!" He said "you will." I spilled my heart out to him. I said "This makes me feel not good enough for you. Not hot enough. Pretty enough. You get off to this shit everyday and I get nothing!! I can't do this anymore!" He said "show me the internet history." I showed him. He acted in disbelief. Then he says "My phone has a porn virus on it and it pops up everyday! It pops up when you go to any site. I don't watch porn anymore!" So I took his phone and tried to go to other websites to see if any porn pages popped up, nope! He said "I'm not lying. You're getting upset over a stupid phone! How am I watching porn everyday when you only work 2 days a week and we spend your free days together all day?" I concidered him watching the porn while he was at work, night shift. Or maybe when he always spends a hour in the bathroom. Although I admit both did seem unlikely. Then he tried to turn everything around on me on how I'm always on my phone too much and he's asked me to stop but I still am on it constantly (true lol but not the point, I don't do anything wrong on my phone). I only am because all he does is watch tv. Anyways! It was all so sketchy and I don't know whether to believe him or not! Is it just a virus? Or is he trying to fool me? I want so badly to believe him. Because if this is true he has an actual addiction to porn and it's definitely effecting our sex life and making me miserable.