Most of the time, people don't cheat just because they feel especially horny or spiteful.
Often, cheating is a natural result of a common problem with relationships, one that may have nothing to do with a lack of love for one's partner.
This extremely educational video from The School of Life suggests most couples are almost destined for infidelity due to each partner's different needs.
Failing to satisfy these needs can lead to people taking on completely distorted views of themselves, and thus, seeking an outside solution.
That's why it's best to communicate these differences before one partner's misinterpretation produces a dangerous imbalance that has torn countless couples apart.