2. Ask him for his opinion on a general statement, like “Do you think all guys cheat?”
“I emphasize that ‘it’s just a common opinion,’” and try to find out what his views are.” You might be able to discuss cheating more casually by opening up the topic in broad terms and talking about guys in general. You might have reason to suspect him if your boyfriend starts to make excuses for other guys, like “I wouldn’t do it, but…”