There was once a woman who commuted into the city each day, her husband at home with the children. They were very much in love and secure in their relationship.
Each day the regular commuters would all gather for the train and inevitably there were occassional nods of recognition between some of the travellers. The women got to friendly with a male commuter who always got offthe train the stop before her own place of work. Slowly the nods of recognition had turned into a greeting, then small talk, and then a genuine friendship grew up through their mutual journey. Each day they shared more of eachothers lives, shared hopes and fears and dreams.
Overtime the woman began to look forward more and more to her daily journey to work with her friend. And then. She realised she was beginning to look forward more to that than her time each day at home with her husband. And it dawned on her she was falling in love with her fellow traveller.
Ashamed at her betrayal but still drawn to her new love she confessed her conflicted feelings with the husband she also still loved. He listened, there were tears, there was hurt but his response took her completely by surprise. He looked her in the eye and said simply:
Proverbs 5:7-8 NLT:
So now, my sons, listen to me. Never stray from what I am about to say:  Stay away from her! Don’t go near the door of her house!