Fiancé watching porn

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So my fiancè has told me before that he watches porn and I’ve tried to over look it but lately it’s really been bothering me, so one day I saw that he had watched it on his phone and left it up. I confronted him and told him how I didn’t like it and he assured me he would stop. A few days later, I went on his phone today and he had cleared his browsing history. I feel like he is still watching it and is trying to hide it.. what should I do?