Question them first. You know ask if them to tell you something they don't like about you.... or ask them have you changed in their eyes.... or say things like "you know things have not been the same lately" or "I'm not being fair to you, I'm not giving you my all" (saying that gives that person the option to decide if they want to accept less)

But, kind of set the tone before you tell them that. It happens to all of us at some point, just hate to be on the other side of it.

Good luck, and watch yo back! afterwards

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Peace, Love and Happiness!!!