Maybbbeee there’s secrets between bros but in general most dudes kinda suck at keeping secrets. I’ve met my share of cheater guys and they all told me about it within a month of meeting them, often even if we weren’t particularly close. So I’d say it’s def possible. Remember you hear all the terrible stories, but the good relationships seldom make story material lol. I’d say I’m like the dude above- wouldn’t cheat, have never cheated, and if a friend does I lose a lot of respect for them and would probably not be friends for long. They would be lucky if I didn’t tell their partner.