A long time ago my girlfriend at the time found lipstick in my bathroom. I lived alone. And it wasn't hers.
I told her she left it there, she has a bad memory, it was the cat's, she had a concussion long ago that affected her memory of leaving it there, “if i was gonna cheat, do you think i’d leave any evidence behind”, swore on somebody's grave (felt bad about that one) and I forget what else. and she dropped it after about an hour :)
I'm stunned to this day. Wish i could call her and ask “how the hell could you believe me?”
She dropped it, nice girl. After an hour. She loved you. None of my biz, but... well, can you get hold of her? Maybe not too late for you 2?
So you were not honest with her.