I am rally sorry you are going through this.
I had an ex (fiance) that was a lovely man in most respects, but he had a history of this sort of behaviour with his first wife, which he told me was due to the fact that she never had sex with him and was prudish.
I lived with him for 5 years, and like I say, he was a genuinely good guy. Always treated me like a Queen, great Father, considerate, gentle, supportive and we had a robust daily sex life which included a lot of kinky fun enough to satisfy any man.
After we split up, I looked at the web browsing history and he had indeed still been frequenting these sites while we were together and supposedly happy.
My point being that someone does not need to be an "obvious" bastard or not in love with you to do these things - but it always, always, always is the sign of a man who is capable of lying, being selfish and not being fully committed to you. Not in the way that matters.
When you marry - sorry - but you forsake this shit. You completely forsake it.
Reality, as hard as it was for me at the time to accept is that men like this are sending you a few messages.
I am happy doing things that would hurt or upset you if I feel you can't see me doing it
I like to get my sexual kicks from other women sometimes
I am more sexually aroused by random teenagers than the woman I love
I act loyal, I act committed...but I am not 100% so
And rally it might seem a small thing to many people, but to be this speaks volumes of a person's character and I could not now ever live with a man who did this.
He will surely eventually let you down - whether with actually fucking a hooker or merely just being a selfish, feckless coward when hard times hit you.
It speaks to character.