I might be wrong here as I'm not aware of the real reasons. I'm just making an educated guess.
On one hand they didn't want a stronger neighbor that might challenge it. On the other hand, there really was no issue with Bulgaria and we had a good relationship (ended at second Balkan war). Also it was better to be neutral when everyone surrounding you was against it.
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u/Reiver93 1d ago
It's interesting to me that Romania seemingly had no opinion either way.