Familiarity--We tend to fall in love with people in our environment with whom we are already familiar.

我们往往,容易爱上身边的人,相互非常了解。

耶鲁公开课 - 心理学导论课程节选

They're falling in love with the wrong person.

他们不是爱上错误的人。

耶鲁公开课 - 文学理论导论课程节选

And my guess is the result is yes, you could but you're not going to feel un-conflicted about it and it's because these two are conflicting each other at the same time.

我的观点是，你可以爱上两个以上的人，你可以这样做，但是你会内心很矛盾,因为这两者,一直思想一直不停地在做斗争。

耶鲁公开课 - 心理学导论课程节选