Husband watching porn in secret

Is this cheating? Or am I being OTT?

I discovered my husband has been watching live webcam as of porn/women stripping in private. Like in the bathrooms and downstairs if I’m in bed.

I asked him about it and he says it’s normal and all men in relationships do it.

We have a good sex life so I jsut don’t understand it? Tbh he has a very high sex drive he would literally have sex 4/5 times a day everyday where as I am happy with 4/5 time’s a week.?

I just feel like I’m being cheated on when he’s getting off watching random women on the internet?