Should i bring this up to him or leave it alone?

Someone ever tell u a story, you believe it & later that day or the next day you’re thinking about it & it just doesn’t add up? Well now I’m thinking about it & it’s bothering me. I know if i bring it up and the truth comes out our relationship is DONE. Like I’m soooooo good✌🏼✌🏼 but this happened almost a year and a half ago we jut happen to talk about it yesterday. Should i let it go? Or bring it up?