Most Helpful Girl
Most Helpful Guy
Insecurity, low self esteem, the need for validation, the need for affection, vanity, selfishness, vindictiveness. The one case where cheating can be understandable is when trapped in an abusive relationship through fear or threat. I see it as perfectly acceptable that someone might seek affection and understanding elsewhere if they are in an abusive relationship and haven't yet summoned the courage to break free of it.