Agree with SM.
All the best.
Hi there and welcome. Well, porn is a quick and easy release and sex requires more of a person. It could have to do with that. And he may have trouble being stimulated now after using porn in the way he has (you say addiction, that means that he uses it to escape).
Now, if someone were my 'boyfriend' which means we are dating and not married and I had to use a statement like they are addicted to porn or wondered why they use porn rather than have sex with me . . . it would be time for me to break up.
Why are you with him if this is the situation? We date so that we can judge whether a person is someone we should be with long term. And sometimes they should NOT be.
I know it is hard to leave someone but any type of addiction situation means that they put the thing they use (in this case, porn) above all else including you.
consider that perhaps this relationship has run its course and it is time to cut ties. good luck hon and we are here if you need to talk