Initially I could just tell by the look in his eyes.
He worked away and the same woman was in a large group in his social media consistently. I had a hunch and her profile was available for me to see...of course it featured him.
He would go into the back garden for a cigarette and I'd see him from an upstairs window texting furiously.
His phone was glued to him constantly. If I had the opportunity I'd move it, say in between the sofa cushions and watch him panic.
The final straw was when I had back pain and took a diazipam...he told me to take two before I went to bed. I told him I did and he thought I was out of it in bed. I took none of the tablets and heard his whole late night facetime that confirmed it. It was engaging/embarrassing and liberating at the same time.
I got tested. Told him I has reoccurring UTIs so we couldn't have sex.
The stuff I did seems completely ridiculous but I had to confirm it in my head and I'm glad I did it.
He tried to get an answer for everything in desperation but by this point there was no moving me.
I felt like I was about to jump off a cliff before I told him. As soon as I did I just felt liberated and relieved.
I must add this was his second affair that I know about. The first one my reaction was a more knee-jerk reaction with zero evidence which meant he gaslit me for 2 years. He confessed to that after he knew there was no going back.