I don't know if she loves me.

Vs

I don't know if she loves me or not.

Could we use only if in the above sentences, without the use of "or not"?

What's the difference in their meaning?

Actually, there is no difference between them, but, we usually use "if" without "not".

I don't know if she loves me.

I don't know whether she loves me or not.

This is just a difference of usage.

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