Help I’m seriously lost for words?

I know it’s shady.. but hear me out. I’ve been with my boyfriend almost two years. He left his phone in bed and he was doing something so I went on it and found he had another random fb account with nothing on it at all. Then his snap chat he had a bunch of random girls on there and Instagram he asked some girl to snap him a nude, andddd I found these old screenshots of random girls nudes.. I don't know what the hell to do because I feel like if I say something I’m going to look crazy but like wtf.
Help I’m seriously lost for words?
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