my husband constantly looks at other woman's FB sexy photos and is look at porn, why?

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The girls on FB he knows or knew. Also in the past I've caught him talking dirty to girls on FB, making coffee dates, sneaking around to see he's ex gf whom for a year I was told was a guy friend named Trevor. We've tried to move forward and just the other day I told him I felt I could trust him again. I caught him hiding some woman on his account n I have a tracker for our kids and I came across him looking at other woman's photos in the middle of the night. Which he has been getting up in the middle of the night saying he can't sleep but begs me to come to bed. As if he is just waiting for me to go to bed. The head games I'm causing myself our destroying my life..advice please?