What is the best way to handle this?

So there is this person that I am "friends" with. I used to technically date (it was complicated), work together, and went to college together. I want to stop talking to her because we just don't have the same mindset as each other. Also, we value different things. The problem I have is that I don't want to leave causing a whole big emotional mess with her. I just want to make a calm exit and she can move on. I stopped talking to her for like a couple of weeks but felt bad because she has like 3 friends and 2 are busy with college. and the 1 other friend is me. But everyone in my circle is telling me to get out ASAP. What is the best way? Stop all contact? Quit the job we work together at?
What is the best way to handle this?
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