from the female point of view, after bangin my way around college, I met my husband---Did not believe love was more than a salespitch, did not think sex was spiritual. Its the programming. Love can absolutely destroy your previous programming to pump-and-dump, which is probably why you have an obsessive interest in her life, rather than the minimum needed to get into her pants. I went from not enjoying sex that much to having these mind-melting Vulcan-Mind-Meld orgasms (its super weird but I can more or less feel what he feels).

it's a pretty radical feeling, but I know what you mean by the suddenness of it. he was in italy while i was at school in switzerland so all the time apart was spent thinking about him, then spending all sorts of time doing nothing with him. Partly I think it must be electro-magnetic or aural in some way----its like you want the person's vibe around you at all times....maybe it means people in love are in tune and resonate harmonically with each other.

Hmm.
Good luck OP, glad you made me think about this. :)