I think you just have to accept that some relationships are not always meant to be so close and it's not exlcusive to one type of relationship. Sometimes that metaphysical bond or glue that holds people together just fades or is no longer serving its purpose. Bonded to one side. I think you can still hold a lot of love for people even with the distance.
Sound advice
How can someone expect you to treat others with kindness if you can't treat yourself with kindness?