conjunction, particle
although; but; even though; I wish that
Sentence-final conjunction expressing strong discontent, regret, or complaint about a situation that is contrary to expectation. Often used when the speaker feels that things could have been different. The 'I wish that' nuance appears when the preceding clause describes a desired but unrealized outcome.
早く言ってくれればよかったものを。
If only you had told me sooner.
もう少し頑張れば合格できたものを。
If you had tried a little harder, you could have passed.
黙っていればばれなかったものを、どうして話したんだ。
If you had kept quiet, you wouldn't have been found out, so why did you talk?