You have my sympathy OP.
I've been with my fiance since Oct 2020, and before we entered the relationship i was very clear to him that i do not accept being in a relationship with someone who watches porn, as its a boundary for me that i consider a form of cheating. Told him about the ex that lied the whole relationship that he never watched it but turned out after split was an addict.
Well guess what he confessed just after new year? Yep, HE was a porn addict and had been watching and masturbating to it twice a week, for more than the first three years of our relationship. That he has stopped now, but it took multiple attempts, but he "Stopped for me!" because "He loves me!"
He confessed because he couldn't take the guilt of the secret anymore and was having panic attacks. He refuses to accept he's no different to my ex, that he too lied to get me in a relationship with him as he knew i'd friendzone him if he told the truth, so hes just as manipulative. He thinks it's silly i think of it as cheating as he "wasn't going out sticking it in random women" but can't deny he knew my feelings and boundary all along.
I can't look at him the same, i would never have dated him, or had any intimacy with him if i'd known. Havent even seen him since, but if i even hint at breaking up he immediately threatens suicide.
I'm torn if i want out, i flip between i love him maybe we can work through it, and wanting out immediately. If he wasn't playing the suicide card over not being able to cope if he loses me, i'd have been gone the night he confessed.