They do exist Caine. I have had many relationships both with female and male counterparts that are just as you describe. I have found that clinging to something usually indicates that there is something laking in ourselves that we are trying to fill. Usually an insecurity of some sort. At least that is what I found in my own personal inward reflection, as well as with encounters I have had with others who have struggled with this. For me growing beyond this is a matter of self love and honest communication. I have had my share of unhealthy relationships, for sure, but have learned to slow down, not over think things and let things flow. I find that when I am in a good place personally, good relationships fall into place on their own. Unforced, uncoerced and naturally take form and are fulfilling just as they are.

Very few people are honest enough to express the fact that sometimes thier love for someone wains faster or slower than someone else. Everyone doesn't love the same way, and relationships always express that.