Porn addict bf

Hii everyone,

it might be a subject that has really different opinions and im open for that. i need to understand something. my bf (23) is a porn addict, he always watches it but he is never honest about it, he hid it from me and lied about it, he doesnt like when i go through his phone when he sleeps, he has emotionally cheated on me once with his colleague, after all that and telling him many times im not comfortable with him watching porn, he keeps doing it behind my back and is so defensive. whenever he tells me he wont do it again, it feels so fake. he also sees looking at porn as normal, i get that but in a relationship of 5 years and continuesly telling im not comfortable with it, is just different to me.

idk what to do, what to feel or what to think