VALIDITY OF CASE: In an LDR, can she cheat w/o letting hinting her college friends except the guy? how to caught her? has anyone done this before?

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if im in and LDR, how to know if she is no more interested in me? what signs?
VALIDITY OF CASE: In an LDR, can she cheat w/o letting hinting her college friends except the guy? how to caught her? has anyone done this before?
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