Mutual struggle for truth

I think 've found the answer to one of my previous questions: What is love?
I've now come to a conclusion that Love is centered upon the mutual struggle for truth. However we have all kinds of ways to use the word love. If we remove all the contingencies we will find that in all cases the essence of love is an emotion.

Emotions like:
Hunger one of the most important emotion.
If you examine hunger it can become longing, desire, lust.
Fear is another very important emotion.
If you examine fear it can become terror, dread, jealousy, caution.
Joy which is the absence of hunger and fear.