Ultimitly, there isn’t any way to know for sure: you can’t take a test or use a checklist or ask yourself just the right probbing questions and prove that what you feel is “the real thing” or that it will last. That’s why relationships are a blind leap of faith. In making the decision whether or not to commit to someone, I think it is less important to compare that relationship with this external yardstick and more important to make decisions not based on the nature of the relationship but on the nature of the other person involved.
Our brains work by classifying things, but for meI don’t think there is much point in trying to catagorize my various relationships as “infatuations” or “crushes” or “real loves”. For one thing, doing that seems to suggest that the time(s) I was “really in love” are more important or more signifigant than the other sorts of relationships, and I am not sure that that is true. I’ve had some really intense, brief infatuations that had–and continue to have–profound effects on my development as a person long after I dropped out of contact with the person.