<human>: Can you condense the text into a few key points?

I don't know if this is the right subreddit for this but I really don't know what to do. I see her everyday at work and I've just been getting angry thinking about the whole situation. I honestly feel like she says things to get to me but that could just be me overthinking. I try not to care but then I see or hear something and it just puts me right back where I was. It really shouldn't affect me this much but the way she just acts likes everything is ok or that nothing happened between us fucking kills me on the inside.
<bot>: Girl I had what she called a "thing" with cut things off out of the blue after leading me on for a while. Her obliviousness kills me and I don't know how to not let it get to me.