I saw a nude photo hubby and another woman; he shows little remorse for his betrayal

A few months ago, I discovered my husband of 15 years was having a torrid affair with another woman. I only found out by accident when I came across photos of both of them naked on his mobile phone.
He swears they didn’t have full sex, and that their relationship is now over.

He wants me to put it out of my head and move on, but I can’t. The trust between us is gone and I keep accusing him of cheating. 
He says if he’s accused of it, he might as well do it. Is this marriage worth saving or should I just call it a day? 

Not only has your man cheated, he also appears to have little or no remorse.
He should be doing everything possible to make you feel loved and secure.
Having already seen photographic evidence of his betrayal, how can you possibly put this out of your head? He’s done it once and I’m sure he’ll do it again.
A lot of marriages survive infidelity these days only when the parties involved believe such marriages could be salvaged.
The ball is now in your court. You need to ask yourself this— do you love him and does he love you?
If you can answer yes to both of these questions, then there may be something worth saving.
(Bunmi Sofola)