You all know the story of when a girl is in a relationship, but then meets another guy who she begins to lean more into till she cheats with him and then leaves her boyfriend. That guy she cheats with will suffer deep insecurities that may never be cured. He will continuously struggle to reconcile the initial events with a honest narrative if he tries to pursue a true relationship with the woman. A lot of single guys are actually afraid of commitment because of the scar sleeping with a cheating girl has caused. Especially if they ve witnessed her showing a different personality when contacted by the main guy. The person being cheated on suffers pain, that may go, the cheater suffers a lot of guilt, but the third person will carry on insecurities that last a long time. Be wise.