<human>: Can you condense the text into three sentences or less?

We met in the final weeks of college and really hit it off conversationally (and physically… like, damn), but I was obviously graduating college and she was just finished her first year. I moved out-of-state for work but stayed within a two-hour drive. It was workable for a while, but for reasons that I'd rather not get into too deeply, the relationship as it is needs to end. I can't keep doing this.

Problem is, I've heard a lot about timing these things, but I can't fake Valentine's Day like she would be expecting – I'm just not that kind of person. I really don't want to hurt her (not an uncommon sentiment), but she's already emotionally unstable and has a (seemingly) *very* poor relationship with her mom and step-dad (who also both apparently secretly hate me and talk shit behind my back…).

We've broken up once before after I moved down for my first job, but then got back together after meeting up with mutual friends… you know how it goes. But now I've moved halfway across the country and realize (again; I know, I'm dumb) that this just isn't the right thing for me (and at this point is wildly unhealthy for her – she obsesses over me).
<bot>: I need to break up with my emotionally-unstable SO before Valentine's Day but would *really* like to minimize the pain. Suggestions?