Fool thinks smart, smart people know they are stupid.

笨蛋自以为聪明，聪明人才知道自己是笨蛋。

youdao

And if you believe he thinks so... either you're sorely underestimating his intelligence or you need to ask yourself, what in the world is a smart gal like you doing with a fool like him?

如果你坚信他真的这么想的话……要么就是你极度低估了他的智力水平，要么你就得问问自己了：像你这么聪慧的女孩儿怎么就跟这么个傻瓜搞在一起了？

youdao