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What did you break recently? Is it fixable?
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It's not possible to break the sink and make it leak by pulling out the stopper. The only thing you could break is the stopper itself. How long ago did it start? Mold takes time to develop. Most likely the sink was improperly installed and slowly leaking this whole time, developing mold underneath. Your stopper shenanigans probably just opened up some sediment keeping it all vaguely together. Make your landlord fix the whole thing, sink, cabinet, and especially mold. It's a serious health hazard.
Edit: rereading this, do you mean the P trap? Still, they aren't complicated, if three people couldn't put it back together it is fucked and probably already was fucked. Landlord problem.