It hurts to see my wife texting with a strange guy

Mahiro was my subordinate, we got to know each other and then got married. After five years of marriage, Mahiro quit his job to be a housewife, and I was always busy with work. Because I was tired from work, I just wanted to rest, and Mahiro kept telling me nonsense about her home. But I don't know when, my wife started to change. She gradually stopped talking to me, instead looking at the phone screen. The frequency of using her phone is also increasing.

I don't know what she's looking at, but she often smiles to herself. When I want to look at it, she immediately avoids it. One day, due to the light from my phone, I couldn't sleep. As soon as I turned my back, I discovered my wife was still looking at her phone. My wife was texting someone, and the content of that message made me unable to believe that this was the gentle, dignified wife I knew...