他深藏我心深处不可触碰
[tā shēn zàng wŏ xīn shēn chŭ bù kĕ chù pèng]
This conveys that 'he' is deeply hidden inside my heart, which can't be touched, meaning his impression has been imprinted on oneself, but should not or cannot be talked about easily or directly due to the depth of these feelings.