怎么会爱上这个人的英语翻译?

没主语啊！估且用“我”吧。而且“这个人”是男是女啊？估且用男的吧。

How could I have fallen in love with this guy?

如果是埋怨懊悔还可以说
How on earth could I have fallen in love with this guy?

我怎么知道?神经病...

How could I fall in love with this guy?

How can I(you) love this person?

啊

How could I fall in love with this person?