I caught him sending sexual messages to a 25yr old when he assumed I was asleep in the bed next to him. I lay and read the messages as long as I could hold back the tears and then sat up and asked if he was enjoying chatting to some young girl. He tried to fob me off to start with until I told him I had been awake reading the messages, I then grab a pillow and blanket and headed down to the sofa mumbling something about being unable to get comfortable. By the time I got downstairs he had texted asking if he'd upset me for once I didn't sugar coat it I was honest telling him that he has hurt me. Instead of apologising he came up with some excuse and said he'd avoid it in the future. According to him despite sharing a bed, going on holiday, booking future holidays and telling me that he loves me we aren't actually in a relationship