She broke it off, hella suddenly, because her ex from out of state, the one who took her virginity & widowed her, is coming to her. I didn't get hella emotional at her I just said okay have a good evening and hung up and cut contact she sent some apologies i've ignored. I established in the beginning we wouldnt be just friends, I've already cut off contact and removed her from social media, my emotions are in check, but its inevitable that I'll cross paths with this girl again. She works somewhere I cannot avoid. How do I deal with her when we cross paths inevitably? Whatever has the maximum impact & return on energy investment

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Help would be appreciated guys

Edit: I'm fully aware this means I demonstrated a lower value than the other guy