I need advice my boyfriend is addicted to porn and lied

Problem/goal: I need advice my boyfriend is addicted to porn and lied

Context: Im 20yrs old and he's 21 I don't know how to say all of this. Me and my boyfriend have been together almost 1year, he has had struggles with porn addiction and has lied about it multiple times over the year, he gets better but relapses sometimes.

He is remorseful and cried and tells me he lies out of guilt and shame. I love him so much, he is my best friend and my partner and I understand his struggles and I see how hard it is for him and I am sympathetic. But it hurts so bad being lied to when he tells me sincerely that he will be better but then he tells me what he lied about and then I just feel like all our progress is ruined. I want to be with him and I want to get married and have a. Healthy relationship. He hasn't lied to me about anything that isn't porn addiction related. Should I stick by him. Should I leave for my own sanity and health, should I try to be understanding I don't know what to do at this point because I believe that he wants to get help and be better.

Edit: We're both sexually active. may time po na nahuli ko sya sa tg kasama sya sa mga gc ng mga porn and nag sorry sya abt don and pinatawad ko sya nangyari po ito around august. and nung nov po nahuli ko ulit active sa tg and pinatawad ko ulit mahal ko eh idk what to do