Visitors Story:
When everything is going well between you two, slowly you get the feeling that there is somebody else whose words and opinions are given more value.
You feel that your partner has a lot of respect for this person and is always emotionally inclined to do things that pleases this person.
You can never make them understand pinpointing this to them. As your partner is not on her/his own she/he will never realize what they are into.
If this other person happens to be of a different(older?) generation and somewhat against your relationship, you can seriously start looking for someone else.