“我知道我不懂爱、离开了才发现心很痛”的英语翻译要对的.

I know I do not know love, only to find out the heart hurts

I knew I did not understand like, leaving have only then discovered the heart very pain

I know that I do not know about love a lot, so when I leave, I finally find how hurt my heart is.

I know that I do not understand love, and I only discover that my hearts hurts after it has left.
自己翻译的，大意没错，希望答案对你有用。

i don't know how to love,yet only after it has left,i found that my heart hurts.

I realize I do not understand love，I am heart-broken after leaving！