Boyfriend and masturbating

I know this topic always pops up on here...but I just want to hear people's opinions. I've been with my bf for over 3 years and our sex like has been amazing. I've always worried about him masturbating to porn, as I didn't want that to affect our sex life. He's always told me that it never will & to no worry about it. However I still do for some reason. He hasn't been masturbating for a while (few weeks ?). Today we had sex & a few hours after I left to go hone for the night. I ft him later on after he worked out & I guess he ended up doing it as well. I started to worry & think maybe I wasn't enough...but he got upset & said it wasn't that. That I was & it felt really good when we did it, that he just felt like doing it later & so he did & that's it. He told me I should never worry about it affecting us because 1). it'll never affect how many times we do it 2). We have sex more than he masturbates 3). I'm way more hot & feel way more good than his hand (obviously).

I know he's right...it's just not processing in my brain. He's getting annoyed that I always worry when he does it & tbh im getting annoyed with myself too. How do I overcome this? I know ALL the answers & he has reassured me more than enough. Help!