A third wheel is a stabilizer. When you have two wheels it either falls over to the side or falls forward/backward depending on the alignment of the wheels. To avoid this, you have to balance or keep moving. A third wheel will stabilize things. So the "third wheel in the relationship" would be a more appropriate term for a shared reason to stay together, such as a child.
Sorry about not posting much recently, I just haven't had that much to post about.
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