<human>: Help! I need advice... should I believe him?

We got married 10 months ago, been together a total of 8 years.

Yesterday he left his emails open and I found many, many emails to and from 18-20yr old girls, asking to meetup and chatting about sex. He gave a few of them our cross-streets and instructions what to wear. These messages go back years, and are sent back and forth many times a day. 

I looked in his bag, found a throwaway phone. Texts from girls, asking about our address, about our home renovation (!) and of course sex and how much they love him. 

I confronted him. He says most of it was "fantasy" but he did meet one girl since we have been married. He said her texts about how she loved having sex with him was "fantasy". Says she never was in our home... He just met her on the corner to give her rent money and talk because she "needed help".

I feel like that is bullshit. Why did she use past tense about the sex (2 times) then? Why is he paying her? 

I simply am in shock because I love my husband. What do I do? I don't think I can forgive. Please, I need some opinons.

Can you provide a brief overview of the text?
<bot>: Husband [36M] caught with incriminating messages to young women with personal details, says its fantasy. Do I believe and/or forgive?