AIBU

[Ididnotexpectthis]

I am 52, DH 48. This morning I have found out messages on his phone with prostitute. They send him price list and address, he is asking how many girls there are. Clearly, a visit to a brothel. DH is working today, so we had only very brief conversation about it. He denied it, said he didn’t go. I just can’t believe it. We have sex at least once a week, all our lives together that was only part that really was good, for him, too- I am really sure about that. I just can’t understand why would he do that?
Just want to throw him out, but part of me thinks that this is really one-off and it is not a really big deal. So confused! Have no one to talk about IRL, as would be too embarrassed. People really think that we are a very strong couple (as did I!). In 20 years we are together I really thought he was a really good husband, father and a friend. I have really thought that I was lucky to have met him.
My head is a mess.
Sorry, not AIBU, really, posted here for traffic.

Get yourself a health check for STIs.
If he went/didn't (although most likely the former), the intent to cheat was there.
Him saying he didn't go doesn't absolve him.
Im not sure a. I would believe him and b. If I would want him back in the house.
I would ask him to leave and give you space and time to think.

He denied it, said he didn’t go.

Of course he said this . They always say they didn't go/ had no intention of going.

Of course he went, or he has visited a brothel befire. The very detail of the conversation suggests a seasoned user of prostitutes.

Even if by some miniscule chance he didn't go through with it this time he obviously has no problem with the idea of buying womens bodies for his sexual gratification.

I'm really sorry OP but you will never be able to trust this man. If you let this go he will continue to use prostitutes but just hide it from you better.

This is the message I have found on his phone. Nothing else. He has probably erased call records.

Even if he didn’t go, the texts are enough for it to qualify as cheating in my book. You don’t have to make a decision immediately, I’m sure you are reeling. But please don’t let him gaslight you into believing it’s ’nothing much’. It is, and women end marriages for less.

Doesn't matter if he didn't go. He had that intention. It'd be over for me and I'd be going for an STI test just incase.