About belongsTo relation in models

Hello, I have a doubt about the belongsTo relation between A and B. If
I make a belongsTo relation, it's mandatory that all the A entities
refers to B entities?

In my case, there are cases where the reference exists, and in other
many cases, the reference don't exists. Should I to create a "null"
entity in the model B to refer it in those cases?

Thanks in advance.

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