Why is my boyfriend texting sex workers?

My husband of 19 years cheated on me with my friends. We separated nearly three years ago and for the last year I have been seeing the most fabulous man.

He is literally the male version of me and I adore him. We have planned ahead for different treats through the year and it all seemed perfect. Then my trust issues or instinct made me check his phone.

There was a message from someone and they appear to be discussing body to body massage. She is obviously a sex worker as cost and extras, but not sex, have been costed. I literally adore this man.

We have a fabulous physical and emotional relationship. I don't understand why he would go elsewhere. Do I just accept this is him? I can't imagine being without him and although I've been cheated on in the past, this feels very different. What do I do?