Is it normal letting my wife sleep with other?

Hi I am 22 years old guy with a beautiful wife. We are into this relation since 5 yrs and 3 yrs before marriage. But 6 months ago my wife introduced me with her friend who works with her in her airlines ( My wife is an air hottest ) he was very gentle looking guy so I react very normal. We began to meet each other almost every day and even I liking his presents. We use to go out for fun, like in hill side or in country side; we used to have lots of fun. As we were meeting everyday we used to have lunch and dinner together too. But one night when we were having our dinner it starts to rain very badly, we were in a restaurant. The weather was getting cold so I stand forward and offered him to have drink. He said yes, I asked my wife for drink too she said yes too but only for beer, I said ok. Then I order a bottle of whiskey and a bottle of beer, my wife serves the drinks for all of us, then we started having talks about different topics. When we had 1 and a half bottle of whiskey we were dunked my wife was also dunked because she ordered a quarter bottle of vodka only for her. The night getting so funful that we all were having fun; my wife was in my arms the guy friend was cracking jokes and the air was so cool. After some time I said that we all should leave for our homes, I paid the bill then we all came out of the restaurant.*^$#$^&**^$#$^&*(&^$#@$^*&%$% Opsh !! that means that after that I and my wife we both were totally down. Then I remember is from the hotel where we reached after the restaurant, we were so down so he said he brought us in this hotel. He took the key and I was filling the formalities of the form, I saw he was talking my wife into the lift, I said wait for me then he said its ok you complete the formalities I will take her to her room. I thought that it was really ok cos my wife was so down she can’t even walk in her own feet.