If you would like to try something new (to you) that might be less "violent" to the people you are dispensing with ...
"This is not working for me, so I would like to go our separate ways." Then (and this is the new part) allow them to respond, and listen to what they are saying. You can respond to their remarks without compromising yourself. For instance, "I didn't know you felt that way," or "I'm glad we had this chat," or "Yes, we can still be friends, but I don't want you to expect much of me. I don't do friendships well."
I hope this gives you some ideas. None of the above statements is untruthful, but it's more graceful, and acknowledges that the other person has feelings and they are valid.
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A finger in every pie.