Basically, what you do is that as soon as you start thinking of this person, imagine a series of events, starting with this person actually becoming yours, that lead to your utter fall and destruction. Like : "We fall in love, I go broke, cockroaches swarm all over the house". Done for two to three weeks, it basically cured me of all these feelings.
The person whom I was most strongly limerant with was both unmarriable and not someone I want to be connected to by a kid for the rest of my life. Using my brain, or perhaps rather the rest of my brain, and not treating limerance as some mystical holy thing is probably in the top three best decisions I have ever made in my life, along with marrying the person for whom I never had a lot of limerance (a smidge, I suppose, but nothing by comparison), just shared values, life goals, senses of humor, and the ability to have a strong truth-based relationship with each other. You know, all that unimportant stuff next to the question of whether I feel floaty around her.
Use your brain. All of it. Nobody will save you if you don't; they all think this same stupid thing.
(For that matter, it's also dangerous to think that a relationship must be built on limerance and once it fades it's "over". I suppose there are more reliable ways to fail at relationships, but this is up there. The question is not whether it'll ever be "over", the question is, what will you have left once it's "over"?)
Personally, I wouldn't consider marrying someone unless I had limerance for them at some point in our relationship. I wouldn't marry someone while I am in the state of limerance because that's a potential recipe for disaster, but I want to know that if I'm with someone for the rest of my life, I can rekindle the fire that once was.
Of course, never say never.
That brings about all sorts of meta-questions. I mean, for starters who's to say that's true? Is what's best for you really whatever makes you happy, or is what's best for you what's best for your genes?
Here's a good example of one in action: http://www.reddit.com/r/AskReddit/comments/cgot5/askreddit_h...