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Only major difference I see between when I was a teenager crushing on girls and the type of love I have for my wife is practical experience.
The latter case was built over a much longer period with a lot of mutual participation on her part, and fairly realistic expectations of who she is. I also refined the dream of who she was to me over the course of getting to know her intimately over the years.
Crushing tends to be less intense in retrospect though you can't really realize the difference until you really fall for a girl in a case where the feeling is completely mutual.1THIS IS NOT RELEVANT ANYMORE