One of my closest friends is currently having some relationship problems. The girl he is with clearly undervalues him and does not really have any desire to be with him. She has kissed other guys and said that she could potentially do it again, whilst they are in this so called "relationship". Even though my friend is not RP he certainly grasps many of the concepts TRP discusses. He knows he is undervalued and that he is acting like a little dog. He is being desperate and needy, which he knows are bad traits. However, he likes her so much that he does not care and will do anything to keep the relationship floating. I have tried to convince him otherwise, but he does not care. My question is this: What should I do? Just wait till she either cheats or leaves him or try to convince him in a new way, or something else?