Why is it called limerence and not just a crush? Because we're older and married? I've experienced something like that a time or two since I was married to Rich. Like you, it didn't cause me any worry or anxiety or negative feelings of any kind though, so maybe it's not the same thing.
I also wonder if mine were the same because they seemed to happen at times when my marriage was in trouble, and perhaps I was opening a porthole to an emotional affair? I never really thought too much about it. But you can bet I'm gonna ponder this for a while.