Avoiding trouble

[9th Engineer]

Any advice on the wisdom of getting into a relationship with the (very) recent ex of a soon-to-be roommate (guy Y)? It's a bit complicated, timed with almost daytime-soap perfection. The girl in question (girl X) is a member of my department I've known for about 1.5 years, I've liked her since I met her but she's been in a relationship with aforementioned guy since before then. He's one of the people in the 4 person suite I'm living in this fall, added since we needed another person and he seemed nice enough. I ran into girl X last week (we're both working in labs on campus right now) and she didn't seem to be doing too well. Turns out guy Y just recently dumped her cold turkey while down at Duke University, looks like she's taking it pretty hard.
I know better then to think that she'll be interested in getting back into a relationship anytime soon, but I'm thinking a bit more long-term here since the housing thing has the potential to cause problems till this time next year.
Is this just a clean-cut case of "don't go there" even though I don't really know the guy and it was him who decided to drop her like a bad habit?

Warning bells going off all over, just wondering if I'm overreacting.