What is the most obvious sign of cheating?

I saw a bit on YouTube which made me cringe a bit. It was satire but it started with a girl telling her boyfriend she's going on a girls trip, just a few of her friends.

Okay, then she says they're going to a club where there's a lot of guys there, he asks why nobody is bringing their boyfriends, she says all her friends are, but she wanted to just go with them.

I know it's satire, but the second I hear "girls trip", I say pretend to be okay with it, but if the key she has to your apartment still works when she gets back, then shame on you for letting her cheat. Even if she hasn't done it yet, the second she walks in and mentioned a girls trip, she'd already made a conscious decision to cheat, months before the "trip" happens.

I don't know, am I being paranoid and insecure, people? Before ladies start saying it's stupid, flip the script. If I was your boyfriend and I wanted to go to a bar with all of your friends and I said you can't come, what then?

Those locks should be changed while I'm out and you should have thrown all of my personal belongings out of the window, that same night. To do anything else is to allow yourself to be disrespected and spit on by the person who's supposed to love you, so please don't ignore signs.

Before accusations come in, no, I didn't get cheated on in this fashion. It did happen, but not in this way, it was much more of a sudden thing. The only indications one of my 3 relationships gave of infidelity was her acting nervous around me despite me being always supportive. Maybe I supported her wrong, maybe when she was crying and asked me to leave one night after a huge fight with her mom, I shouldn't have held her, anyway, or maybe.

But in the future, if a girl I love cries, you'll have to strangle me to make me stop trying to comfort her and even then, my dead arms will still keep her warm, so judge away, if you like
What is the most obvious sign of cheating?
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What is the most obvious sign of cheating?
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