look at the facts.
he HAS been sending sexual content and texts to women. LOTS OF THEM
He ISN"T being exclusive, not even trying to be, as the numbers of women he is communicating prove.
I shall write this in caps so you see it, not necessarily shouting at you
IT DOESNT MATTER ANYMORE, YOU HAVE THE INFO YOU NEED TO SEE THAT YOUR INSTINCTS WERE RIGHT.
YOU ARE IN ONE RELATIONSHIP WITH HIM BUT HE IS IN LOTS OF RELATIONSHIPS.
You are only one of the people is in a relationship with. YOU are one of MANY. He doesn't care enough about any of you to be exclusive or to be concerned that he will lose you. any of you.
You have HAD the chat about exclusivity before. it didn't mean anything to him.
The BEST thing you can do is to tell him that you and he are in different places in the relationship and that it's best if you split so you can find the right person for you.
you owe HIM nothing, you owe yourself the kindness of doing what needs to be done now.
You can be kind to yourself after, you can hurt and heal after, but he is not going to heal you, only hurt you further.
he is not worth a second's thought. You thought he was. He could have been, but he let YOU down.