Wonderful article! My 2 Cents (not feeling based). I am a nerd, sorry.
In Neuroscience, To get ºÜ°®ºÜ°® someone means you gain a complete control over his/her hormones, which are especially active in the brain's emotional center--the limbic system. And the limbic system, as one of the dominant decision makers in the brain, makes him / her to stay with you as much as possible.
But you may not get a complete control on the other major control center of the brain, the frontal cortex, the logical planning center. And frontal cortex is the most prominent one in a mature human brain. So his / her logical planning center could command him / her another way. Which could be as ^×ÔÓÉÄñ^ said ÈÃËû/ËýÑ¡Ôñ×Ô¼ºµÄÐÒ¸£.
To give some links on how neurosciences explain the brain and the love it generates.