Angry or horny?

[sonar]

I reading this "Ilikecheatinggirls" blog on Tumbler wher some people sharing her/his own stories too anonimously.

I red this: "A day ago my girl went out with two of her friends and came back late only with one of her friends and with a guy. She knocked at my door but I pretended to be asleep, so they went to the living room and closed the door. I heard them laughing and flirting, all three, and not after a long time, I began hearing kissing noises. I went out of my room and began listening behind the door exactly when my girlfriend was telling to the guy "You can cum in my mouth". I never was so excited and horny."

So a question crop up in me: would you angry or horny if you hearing your gf or wife moaning on somebody else's dick when she thinks you aren't home or sleeping deeply?

Is it alredy happened someone of us?