Learn Turkish: Adam eşini neden aldatıyormuş? - Why is the man reportedly cheating on his wife?

It breaks down as aldat (to deceive/cheat) + -ıyor (present continuous) + -muş (hearsay/inferential). The -muş suffix shows that the speaker didn't witness the cheating but heard about it from someone else. That's why it translates to "reportedly cheating" or "I hear he's cheating."

Why does eşini end with two -i suffixes?

Let's break it down: eş (spouse) + -i (possessive "his") + -n- (a buffer letter used after third-person possessive suffixes) + -i (accusative case marker). The verb aldatmak (to cheat on / deceive) takes a direct object, so the person being cheated on must take the accusative case.

Does the word eş specifically mean "wife"?

No, eş literally means "spouse" or "partner" and is completely gender-neutral. In this sentence, because the subject is adam (the man), we naturally translate eşini as "his wife". If the subject were a woman, it would translate to "her husband".

Could we put the question word neden at the beginning of the sentence?

Yes, you could say Neden adam eşini aldatıyormuş? However, Turkish generally puts the most important piece of information right before the verb. By placing neden immediately before the verb, the speaker strongly emphasizes the "why" part of the question.