Porn/relationship advice needed

So My boyfriend and I’ve been together for awhile , I’m really uncomfortable with the idea of him watching porn and it makes me feel bad about myself like I’m not good enough and I don’t want him jerking off to other girls especially like his stripchat and onlyfans but he still does .

Is this cheating ?

How are some of you guys In relationships okay with this and it not make you jealous like any advice ?

Edit : I will not leave the realtionship as I’m too attached and no matter how much it hurts I still love him to much.

He is my first boyfriend and first everything