You can never control who you fall in love with, even when you're in the most sad, confused time of your life. You don't fall in love with people because they're fun. It just happens.

This quote means that you cannot choose who you fall in love with, even if you are in a very difficult and confusing place in life. It is not something that you can decide or plan; it just happens and it is not because the person is more interesting or exciting than others. It is just something natural that occurs and cannot be controlled.