What would you do?

Would you be upset if you found this on your mans phone? Like clearly the rest of the messages have been deleted. I did see him writing a long paragraph to someone last week I just didn’t ask who. I was trying to give him the benefit of the doubt. 🤷🏽‍♀️🤦🏽‍♀️

Update 1- I messaged the girl this morning she never responded. He definitely knows something is wrong I left without saying goodbye this morning. I’ve barely texted him back all day. He arrives home LATE from “school” I sit on our bed as if he didn’t just walk in the room I stay focused on my laptop. He asks me a question I shrug my shoulders then point to what he was looking for. He said something is wrong I never break contact with my laptop he walks out of the room.