我不怕你走但怕你忘了心
[wŏ bù pà nĭ zŏu dàn pà nĭ wàng le xīn]
I'm Not Afraid If You Leave, But I'm Afraid You Forget What We Once Had expresses deep emotional concern. This reflects fear of not loss in physical distance but in emotional memory; that despite all shared times, someone may forget about the relationship.