You poor love.
Preserve your dignity and just get rid of him. You don't have to talk. You certainly don't have to talk tonight.
You do know it's utter bullshit, about the password reset, yes?
Of course he doesn't want you to see the evidence. Why on earth would he change the email, delete the email, oh and for good measure enter random password? Come on lovey, you know that's not how new passwords work - you enter it, you enter it again. And he deleted an email account? Please.
He is keeping you out of that account because of the evidence.
My XH used it to book prostitutes, and had feedback left for him twice (out of many more bookings - so I don't think it's that common to leave it)
He never paid anything via AW, and actually the bookings weren't confirmed on it anyway. Without the feedback it would have "only" been circumstantial evidence.
He would message asking for a booking with his mobile number. Then it all seemed to take place via mobile. Most of the replies were more if they were saying "sorry Hun (there was a lot of Hun!) missed this, I'm working Tue and Thu next week though" (he seemed to not plan ahead at all - which was him all over!)
So if you do get access and see no confirmed bookings or payments, that means nothing.
I know how hard it is to walk away when you want to know exactly what has happened. But you really are best just walking away now. He has been paying other women for sexual services - and he thinks you're thick as two short planks and will believe his shit about deleted email addresses from desperation.