I gave this more thought after reading more on the meaning of Kings on that said the focus is on behavior, not people with Kings. I think that rather than a person coming into my life, the King of Pentacles represents my own capacity to be independent from others on a material plane. More specifically, the past lover this spread refers to was my first lover when I was very young and inexperienced. His leaving from my life has forced me to build myself up. The past lover represents the security I though I needed and could only obtain through a man. My feelings as of late come at a time when I am finally coming into my own as a professional, which is a more masculine role than I ever thought I'd have.
With this insight, I see this reading in a much more positive light. He came into my life to show me love and dependency and then he left just as suddenly, but just in time that I was still young enough to find my own way.