This is historic, although recent. In a nutshell DH became suddenly very ill and he stayed in hospital on and off for a period of about 2 months. I was very busy with work at the time and would also drop him off, pick him up and visit him when I could. I felt very tired during that time. On the days I couldn't visit because of work, we would message and it was nice messaging, I felt we actually became closer because we were messaging because we couldn't be together physically.
Then it changed very quickly. Bizarrely, it coincided with him getting a new phone although this might be a red herring. The messaging stopped and he became quite short with me. He was discharged from hospital and over the next 6 months, became more and more moody. I put it down to meds he was on, although he was being weaned off them but he was getting worse - like he didn't like me that much.
I eventually asked him if he had developed feelings for someone else and he reacted aggressively, saying he wanted a divorce. Other family members got involved and he changed his mind about divorce. Some two months after this there was one morning where he looked like he'd been crying. He is absolutely adamant he wasn't having an affair.
Everything about this - to me anyways - points to him having a sudden emotional attachment with someone. I wondered if it might have been someone linked to his hospital stay, but I've never asked him this. Would you think what I'm thinking if you were in my position?