My boyfriend told me he has a porn addiction

My boyfriend and I have been dating since February 2018, so nearly a year and a half. We have been doing long distance since January 2019. So yesterday while we were on our weekly video chat he told me that he needed to tell me something, that his therapist told him he should communicate with his gf. He said he has a porn addiction. I didn’t see it coming because in all our time together I have never caught him watching porn and we ve openly discussed about porn and it never really came up. Obviously I had questions. He doesn’t do it while he is at work, and has never done it while he was around me. I asked him what the frequency is, since I ve no idea what constitutes an addiction. He said once a day, on the days when he has nothing to do. Apparently it helps him sleep better too. He said he s started to go to the gym to work out, and apparently it has been helpful since it wears him out. I appreciate him coming forth and telling me about it. I’m not sure how to process it though. Any thoughts?