明知你是毒我亦中了毒
[míng zhī nĭ shì dú wŏ yì zhōng le dú]
Translates into 'Knowing that you are harmful/poisonous to me, but still getting addicted', it shows an emotional entanglement that can feel harmful yet unavoidable. This can apply to addictive substances but more likely refers to an unhealthy dependency on another person or situation.