Examples include locking themselves in the bathroom if previously they were happy to keep the door open, or if they all of a sudden get ‘twitchy’ if you sit near them while they’re supposed to be working online.
They may also share less with you about their day.

A key thing to be wary of is if your partner previously spoke about a ‘friend’ at work they had all the time then suddenly stops mentioning them at all. Cox says this ‘usually means the relationship has moved from an emotional to a physical affair’.
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