Is watching porn cheating? Help!!!

So I use to literally tell other females that porn is porn and it’s okay for your man to watch porn. Only because my boyfriend didn’t watch it as much, but nowadays he watches it almost every night. I am quite insecure now, I feel as if he needs to look at another girl to get off. I have never felt this way. I jokingly ask him about the porn, but he just laughs it off. 😩 I don’t know what to do. I apologize to every girl I said it’s okay for your man to watch porn. I now know how it feels. It hurts.