C160 The person closest to me hurt me the most

When I woke up the next morning, I discovered that Zheng Yu had not been home all night. This was the first time since we were married that he had not come back to sleep. I picked up the phone and called him, but I was unable to reach him.

Could it be that this matter was so serious that he could stay out the night? I very much do not understand why, as a married man, at least