Infidelity rarely announces itself with a dramatic confession. It begins much more quietly, with a small, unsettling shift in the rhythm of a relationship. It's a tiny, nagging gut feeling, a change in routine you can't quite put your finger on, or a new phrase they suddenly start using.

An online community asked people who have been cheated on to share the moment the seed of suspicion was planted. The responses are a heartbreaking catalog of red flags that are easy to dismiss in the moment but glaringly obvious in hindsight.

Discover more in 30 Ways People Found Out That Their Significant Other Is Unfaithful

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Our shared doctor encouraged me to get STD testing because “you never know people all the way.” She stood there and said

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