你一枪崩了我说是枪走火
[nĭ yī qiāng bēng le wŏ shuō shì qiāng zŏu huŏ]
It expresses resentment or regret towards the betrayal when it happens in close relationships. Literally translated as 'you shoot me with a gun but claim it is misfire', which indicates the pain from deceit.