In fictional stories, positive interactions can start with respect. For instance, the young man can respect the married woman's boundaries and her family. He could offer to help her with something like gardening, but always make sure it's in a public and appropriate setting. This shows that he values her as a person and not in an inappropriate way.
A young man and a married woman can also have positive interactions through acts of kindness. For example, if the woman's car breaks down on the road and the young man stops to help. He calls for assistance or tries to fix the problem if he can. They can then have a conversation about how important it is to help others in need. This creates a positive connection between them that is based on good will and humanity.