[X] Talk to Ilyana. Sure your relationship is more on the professional side, but Mother's dragged her into this already - and besides, if she's been happily married this long she's got to know something about relationships.
[X] Go back to the spire and check in on Datu and Lyrros. You feel like warmed-up crap but hey, at least they seem to be getting along alright. Maybe it'll be the pick-me-up you need.
[X] Talk to Amina. Sure she's your employee but she's smart and capable, and shockingly insightful about you to boot. Maybe she can shake something loose you'd otherwise miss?
[X] Just go fucking drink. You don't know what to do and frankly you don't want to even try figuring out what to do right now. You just want to forget this day even happened, blaze through the back half of it in a blur, then start over next morning and see how that pans out.
[X] Go looking for a demonologist to check on whether everything Belial said was true. It's not that you don't believe him it's just... you want to believe there's still something you can do. Some new angle or subtle loophole.
[X] Go back to the spire and ask Abzu for their expert opinion. They're a wizard, and they've spent a good long time researching all sorts of things while waiting for their master to come home. Surely they'd have something to add?