Not sure if she's quite detached from reality enough yet to entertain this as a realistic option, but I'd certainly love to watch her moronic attempts and related delusions ("He was my soulmate after all, and I know he wants me back. I just know it. He just needs to let me into the apartment one more time...").
It's all for naught, though. No chance in hell he's taking her back, even as a "roommate". While I'm not as much of a Bibi fan as some others (I feel like there just has to be something hideously wrong with you when you not only shack up with Chantal, but then proceed to endure and passively enable her for years and years), I've always thought of him as one thing: a mostly very normal, baseline functioning adult, and as such, he's just not self-destructively retarded enough to repeat such a grave mistake within a year's time. Especially not now that he's got another taste of the single life, which in his case means being able to breathe in his own apartment without gagging, having the food he put in the fridge last night still be there in the morning, and getting a good night's sleep without waking up to the noises of someone screeching SHAAAAM and wheezing uncontrollably at a particularly funny fart they just squeezed out in front of a worldwide audience while inhaling a serving tray of Goopy Carbonara.
It really would be fucking funny, though.