How Can I Properly Punish Him Bec Of watching too much porn?

How can I punish my husband for watching too much porn? I just posted here a few days ago my problem with my husband that is always watching porn (daily 2-3x a day) even if we have an active sx life. And viola, I just caught him really in the act when I entered his man cave (computer room). I asked him what he is doing- he admitted he is mstrbating and of course while watching porn. I asked why does he need to watch porn and he couldn't give me an answer. I cried in front of him bec I've been keeping it to myself that I am having body insecurities now because of what he does. He said he won't watch anymore but I just don't believe him coz I've already told him about it before and he didn't stop. He might be thinking I wasn't serious back then no until I cried infront of him. Until now I do not talk to him. I want him to realize that it is wrong to mstrbate looking at other women while I was here doing my best everytime we have sx. I felt stupid doing somethings for him just so he can be satisfied but that doesn't seem to ne enough for him as he still looks at pornography. Yes I am pregnant right now, 35 weeks. But despite that, I try my best to satisfy him, Ako pa nga nag-yayaya sakanya most of the time and nagpapaka pornstar ako for him even hirap na ako sa tyan ko para lang di na siya manood ng porn. How can I punish him? Is completely not having sx with him for months enough? What can we do to fix this?