#4 – Opportunity
This is a reason that is usually the most painful for women because it is the most difficult to understand. Everything is going really well, a couple is perfectly happy and then he suddenly cheats with some woman he barely knows just because he had the chance. The obvious reason was opportunity but the fact is that there were many sub-reasons that muted the alarm bell: personal characteristics, current relations between partners, confidence, alcohol or upbringing and many other known and unknown reasons.