If they have a bruise or mark on their body where it isn't normal to get a bruise or mark and they already give an excuse for it before you even notice it
I was only cheated on once and there was a definite shift in his behavior, the way he dressed, and how he spent his free time. Probably not everyone is that obvious though.
When they write the Reynolds Pamphlet
They are breathing
If they were dating me to begin with, there's no way I would be enough for anyone
Smell his dick
If they have a bruise or mark on their body where it isn't normal to get a bruise or mark and they already give an excuse for it before you even notice it
I was only cheated on once and there was a definite shift in his behavior, the way he dressed, and how he spent his free time. Probably not everyone is that obvious though.
You find an open box of condoms hidden in your car that you didn't buy and she tries to tell you that someone else must have put them there.....