An interesting thing about fidelity is that it is often assumed by both parties without much discussion. Infidelity, is much easier now and with the internet, all the ground rules have completely changed. There are so many more ways of being “unfaithful” which involve desire but not necessarily the sexual act, without even leaving home by doing it on-line. Being unfaithful is NOT always about wanting to leave the primary relationship as it is about playing and having fun.
It can also be about feeling trapped and bored with the ritualised, habitual, sameness and routine and; often feeling burdened by financial pressures, roles and responsibility. Put kids into that equation and the expectations go up the Richter scale.
Let’s not kid ourselves all relationships go through up and down periods but what it really comes down to how strong and deep the relationship was in the beginning. Relationships can be re-revived and re-connected but it requires open and honest communication, regular servicing and maintenance by both parties. Some transitions which occur in relationships, often happen out of our consciousness awareness, without self awareness we can find ourselves caught up in the closeness of another person purely because of proximity outside of a primarily relationship but juxtaposed in time and space. Couples need to discuss monogamy rather than expect it.