I however personally believe that absence makes the heart grow fonder because absence propagates negative emotions. This might seem a little backwards, but it seems quite true. These negative emotions lead to appreciation and reminiscence, which is also a little backwards. Fortunately, your negative emotions produce a positive consequence: you are able to better appreciate that person's presence, and you try to make the most of it.
So, despite the disagreements and altercations... I still yearn for more. And it doesn't feel all that bad :)
To whom it may concern,