We are in our 40s. He's very attractive and I used to be too until I put on almost 7 stone after having DC.
He told me a few years ago that he doesn't find me attractive due to the weight and we've lived as virtual brother and sister since then. I wasn't much bothered at the time, our relationship was very bad and I would rather have lamped him than shagged him then. There is no affection whatsoever. No kisses,hugs etc.
He has done nothing to make me believe he's had any affairs but he works in a job where he doesn't come home at a set time each day so could easily spend the odd few hours doing something I wouldn't know about. He absolutely denies doing anything.
I know women have been attracted to him in the past, at work and school mums. He's very fit, and muscular and in no way 'old'.
We have had many rows about me not being able to believe he has gone without sex for so long. He doesn't masturbate either apparently 
.
Time has improved our relationship, and the bad patch wasn't all down to him. I was dealing with something really difficult and he didn't know how to deal with it. He instigated sex a few days ago but I couldn't get the idea out of my head that he could have been with someone else so I declined.
Aibu to suspect he must have done something?