NEWSFLASH
People of opposing genders are capable of platonic friendships without any funny business, it's not unusual, and it doesn't mean anyone is cheating.
Sincerely,
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okay yes I'm poking the wasps nest a bit, but people are allowed to have friends without being accused of cheating.
People who are cheating whilst claiming they're just friends, are NOT the same as people who are genuinely just friends who care about one another. It's incredibly controlling to deny partners friendships just because they're a different gender.
Romantic partners are not your personal property, and checking up on someone just because they're talking to someone of an opposing gender is toxic as fuck.
If someone has form for cheating, that is different. You wouldn't be unreasonable for worrying. But, the sheer amount of OMG I AM NOT COMFORTABLE WITH THIS!??1!1!!! scenerios here, and other places online, is eyeroll inducing. Please stop trying to force people into archaic stereotypes where marriage and partnerships mean ownership.