Forthis redditor, it was her husband and her sister becoming too close that raised somered flags.
According to Dr. Tobin, there are usually tell-tale signs of an affair.
Theres always a change in behavior.
When paying attention to such red flags, one might want to take their partners past into consideration.
In this case, both the husband and the sister are disloyal.
Scroll down to find the full update in the OPs own words below.
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