A couple of years ago I discovered that DH was messaging another woman seemingly out of the blue. The first I noticed was when a message pinged through to his phone in the evening while we were watching TV and he picked it up, looked at it and ignored it. This is really out of character as normally he'd mention something about who it was and he'd usually reply.
I later checked his phone and a woman was asking how him and his family were.
He had never mentioned they were messaging so I was quite surprised. During that time, I had noticed a difference in his body language. He seemed tense sometimes in the evening, sitting with his legs crossed away from me, not relaxed at all.
After I asked him why they were messaging, he seemed to stop. She sent a couple of messages after this asking where he was, like she hadn't heard from him. She called him by a nickname rather than by his real name.
I haven't checked his phone since then. But he seemed to jump when it pinged the other evening. I've also noticed his body language is similar to what it was back then.
Would you check his phone again if you were in my position?