Am I the problem?

So, my boyfriend and I have been together for 2 and a half years and he says I'm his "dream girl". But he always will watch porn.. I don't care if it's every once in a while, I get it, and we do stuff pretty often but it's almost every day and sometimes it's at 4am.. and just recently he went and bought a girls onlyfans.. is this stuff normal and I just don't get it? I talk to him about it and he apologizes and gets depressed and says he won't do it again but then he goes and saves it on his phone on a random app so I don't notice it? I guess I just need some sort of advice or answer
Am I the problem?
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