@PHILOKEV @MtnDuck Thank you for this! The department didn't pressure me to decide soon or anything, they didn't even bring it up. They just seemed to be very interested in what other offers or potential offers I had and wanted to be updated, so it is less about the timing and more about how much I should disclose to them. If I hear back from the other school and it isn't an acceptance, should I just withhold what I hear back unless the department asks? I would definitely need to think about what I would choose if I got both offers because I don't definitively know if I would choose one over the other, so that isn't the problem I am talking about here. I am just worried if I get rejected or waitlisted and then have to tell the first school about the position I am in (like if I am rejected and I don't say anything, how bad would that be to do or is that recommended?) It feels like I am in a good position in limbo, but it all might fall apart if I don't have the advantage of another acceptance and in that case I would worry about getting in trouble or something for not telling them about a rejection or waitlist if I have found out about it. I recently got another rejection, not from a school I interviewed at or anything, but it made me think about this potential problem (I have a feeling this might be my case based on some information I recently heard).
Basically, do I have to tell a school about the negative outcome of a potential other offer (like a rejection) or does that look really bad to hold off even if I know the result? If I get waitlisted, would it be to my benefit to tell them or should I say I am still waiting and then see if I get an acceptance? I would be waiting to see the result of that anyway before I could decide, so I don't think I would be holding anything up unnecessarily. I am interested in what to do in both case scenarios (waitlist vs rejection).