Isn't the notion that your SO has to complete you utterly stupid?

Do you find the notion that one has to be completed by another person to be utterly ridiculous? Many people believe you have to have that Jerry McGuire moment where he tells his love interest that she completes him. Isn’t that silly thinking causes more unions to go crashing and burning than cheating? Instead if relying on yourself to complete you and make you whole if you hand that assignment over to another (and there is no way anyone can live up to that 100%) you are setting yourself up for let down? How can someone complete another when they are down with the flu, battling cancer or some other illness? When you expect someone else to complete you that is a lot of expectation and if you are not happy instead of looking inward you will always be looking outward and always finding those who can’t keep you whole 100% of the time.