It seems that these ideas always occur to me when I'm collecting and sorting my laundry from the dryer.
On occasion, I come across one sock that has properly gone through the dryer cycle (IE warm and appropriately dehydrated), and when I happen to find its shidduch shortly thereafter, it still has some moisture left (usually in the toe/sole area).
This would seem to parallel the sometimes occurrence of the suggested couple who are very well made for one another, and all indicators point to a happy, long life together - with the small exception that one of them just isn't quite ready yet.
The damp sock is hung out to dry, or thrown back in for another cycle, and not too long thereafter they're ready to be rolled up and placed in the sock drawer.
So too, once things line up just right, and the obstacle/hindrance is removed or resolved (whatever it was), the couple can finally get a move onto the start of their matrimonial journey together.
I've seen this happen to a relative of mine, and heard stories from others as well. So cheer up, it might just not be the right time just yet for that certain someone you've been keeping an eye on. Take the chance to work on your middah of patience, and hopefully it will all work out for the best.