What would you do if a letter came through your door addressed to your husband from a Hotel?

well thats what happend to me the letter came in the post with the hotels name on the envelope addressed to my husband so i opened it.i got a shock as i read it and it said the time date and area on it also for a room for 2 people.so i waited for my husband to get home from work i asked him about the letter he said he had booked the room for his mate because he had met a woman and he had no I.D and that he still lives with his mum. i said that is a bit weired and i dont believe you because the date on the letter is the same as when my husband said that he was going to devon u.k.to get a car and that is a 12 hour drive there and back from where i live in england so.i also phoned him 3 times at different times that night to see how he was and all the time he took his time to answer his mobile phone and i couldnt hear the car it was very quiet.he got back to his garage quick within 12 hours.he says he has not been with another woman it was a favour for his mate who he wont let me talk to.