Well-done sir Hive account@chbartist.
Some of these intrusive thought are a reflection of who we really are deep inside; sometimes it just requires self-realization and basic acceptance of these facts... The more we deny these thought the stronger they become. It is after we realize and accept the truth only then can we work on the behave part of ourselves that actually breeds these unhealthy thoughts. For example, the thought of cheating on one's spouse, it is essential to understand and admit that we are human and are liable to cheat on our spouse if the right circumstances are encouraged. Only and understanding of this weakness rather than its denial will help us develop arsenals that help us remain faithful to our spouses. Such arsenals include: making a firm decision to love him or her despite flaws and mistakes and forgive easily, finding true comfort in the Company of our spouses, doing activities that show love and appreciating everything about them and just being content with them. Through these arsenals the grip of the negative thought of cheating is weakened and disabled and replaces with thoughts of love and a better relationship.
So self-realization, acceptance, understanding and taking firm actions are just necessary. It is said "in order to take a high jump above obstacles, one has to go down to almost ground level to spring up effectively"