I'm going to call the cops on my boyfriend because of his questionable porn stash
Why do you want to mess with his private porn? Do you think there is something illegal about it?
I just think that the sheer amount of the porn collection is suspicious and inappropriate for me
You may feel uncomfortable, but there's nothing wrong with him consuming porn unless there's children in it. It's not worth the police's time because of all your trust issues, that's a therapist's matter. You are taking valuable time from the officer when they could be catching a robber.
I'm going to have to think about it.
I hope you will realize this is more of a personal matter than a legal matter if his porn material is not of an illegal nature.