I looked at him and I thought: I can't understand him at all and then it hit me: I don't need to. 

The most incredible thing in life is that you can know a person for many years,
thinking you know everything about her, to the point that you have a clear picture of her in your mind. 

But still this person manages to surprises you with her unexpected mindset,
with her unexpected actions,
with the simple fact that she's not the same person as she was the day before.
You will likely never going to be able to completely get to know her and that's okay. 

Humans are complex. 

Your job is not to figuring out every detail about her or to get all her motives. 

Your job is simply to love her for the kind of person that she is and let her be the most unpredictable and confusing version of herself.