Guys, He moans about he's wife to me?

My friend who is married nags about he's wife quite a bit, I don't understand why he is telling me? He texted me saying he has to do everything and he is always in her bad books etc. Wouldn't he message one of he's guy friends? I'm trying to figure out why and what he is expecting me to say lol
Guys, He moans about he's wife to me?
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