Talk about timing; I’m right about to cut some old friends loose myself.
For the past several years, most of my socializing has been with a sci fi fan club. I’ve been losing interest in sci fi for the past few years, and I’ve become aware of the nastiness of the club’s politics. So I’ve also been losing interest in the people, as well.
Then late last year I joined my tae kwon do school’s competition team, and early this year I pretty much disappeared for a few months into the world of tournaments. Club events just didn’t fit my schedule any more, and I didn’t have much time to talk on the club email list.
During this time, I realized that several people in the club were being very annoying (from my point of view). I realized that these were no longer the kind of people I wanted to spend my time with.
So in a few days, I’ll be quitting the club, and sending out a final letter announcing my departure. I realistically do not expect to see most of these people ever again, at least not in a way that significantly affects my life. I have given serious consideration to this fact and have accepted it as necessary.
When I go my merry way, I will give these friends the only reason that matters for cutting them loose: My interests have changed, and we have nothing in common any more. I’m going to completely skip any mention of people being rude or annoying, or of slights real and imagined. My intent is to leave on a positive note, or at least a neutral one; there’s nothing to gain by leaving in a huff.
Once I go, if any of the people I’ve cut off try to contact me directly, I’ll give them a simple “Thanks, but I have other plans.” No other explanation is needed, or will be useful. If they call me, I’ll give them a few minutes, then tell them that I’ve got to go. Again, no explanation will be useful, so I won’t give them one. As it happens, I don’t expect them to contact me; that’s part of why I’m cutting them off.
So my suggestion for the OP, and others with similar issues, is this: Skip the excuses and long explanations; leave with a polite message that your interests have changed. If they try to stay in contact, tell them politely and firmly to go away.
In conclusion: Be polite, be neutral to positive, be gone, and you will be moving forward with your life.