对你掏心掏费纯粹自作多情
[duì nĭ tāo xīn tāo fèi chún cuì zì zuò duō qíng]
'Pouring all my heart and expenses to you - purely self-induced infatuation'. It shows an action taken in earnestness ended up being one-sided affection or love that was not acknowledged or reciprocated by the recipient.