A lot of women, as they grow older and especially after they're married, tend to cut their hair above their shoulders. Some even get waht might be considered a "masculine" haircut.
This does not mean that they're lesbians. It usually means that they're tired of the effort it takes to maintain long hair, and/or they know that once they're married, they no longer have to look as attractive as they were when single.
Thus, if a man is married to a woman, and she suddenly starts taking greater interest in her appearance - including letting her hair grow out - you can bet that either she has found someone new, or she fears that her husband has found someone new.
It's not a sure bet, although there are few other reasons for anyone to want to look attractive.
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