Suspicious texts

This morning my daughter was playing with my husbands phone and he got a message from this number not saved I respect my husbands privacy so I don't go into his phone I just handed him his phone and said babe you got a message and that was it. My husband is a manager at a izza shop during nights and I do all his paperwork, pays and rosters as his English isn't up to scratch and in my book I have his workers names and their numbers and I came across a girl named Courtney and her number looked like the one I saw on my husbands phone but I wasn't 100% sure, even if it was her it could just be that she was calling in sick or what not probably something innocent.. so I just asked him. "Honey did Courtney message you this morning?" And he EXPLODED cussing me out telling me I fucked his day up by starting my shit and accusing him.. he said the message in the morning was from his male friend and stormed out the house to go to work.