Love
Like
Anti-Passion, Dispassion, Passion
Dislike
Hate

The scale of love-hate indicates the degree of empathy.

The easiest way to measure this is to determine whether one feels happiness or pleasure when good or bad things happen to the subject concerned.

The scale of anti-passion to passion indicates attraction.

Parallels could be drawn here to a desire for proximity. I am not sure if this is the best metric but it seems to fit.

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Incidentally one can love and have self-interest. There is a reason why they say that one must love oneself before one can love others.