4. “I don’t believe in friendships with the opposite sex.”
You turn a suspicious eye on her friendship with another guy. Don’t assume that your belief is always correct. There’s plenty of debate about whether you can have a true friendship with the opposite sex. It all depends on the individual. First and foremost, do not accuse her of infidelity without concrete evidence. If you’re simply jealous, tell her jokingly that you’re envious of their strong ties.