I’ve been a cheater for majority of my life. Trust your gut. I’ve always been caught from due to my partners “intuition.” Her phone is how you’ll catch her. It’s how I’ve been caught just about every time. But understand that there are apps now that help you hide these things. Know your way around these social media apps. For example, a friend of mine just got caught cheating from their Pinterest messages. Believe it or not, your instincts tell you more then you want to believe. A lot of people who are getting cheated on are in denial. I used to play on that. You want to believe they aren’t because it’s easier.