I have a friend going through this right now.
My concern is that if you worry about this then you aren't fully over her. Also, that the desire to tell her she's out of your life is just a complex way of being in her life. An argument or hate is better than nothing.
BUT if you're serious about being over it, then I suggest the 3Ps: Prim, Proper, Polite. Never be rude, but never encourage anything. Only take part in small-talk and do so minimally: Yes, No answers. Be polite but dull. Always try to be genuinely busy if she wants to meet. Never start a conversation or encounter yourself. Soon things will just fizzle out and you will be acquaintences that drift ever further apart. If that's what you want.
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I've been 4thTimeLucky, you've been great. Goodnight and God bless!
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