When you ask me this questions.

Your feelings aren’t the same as they once were.

If you feel nothing when you look at the person you were in love with

You think about the person but no longer care. You wish them will but don't want them anymore.

Evasive patterns and behaviours, likely to overload stimulation on other things like alcohol, drugs, other peoples attention etc, almost burying away from them. Grey rocking and trying to appear as uninteresting as possible etc.

you dont feel love anymore

The fact you're asking this may be a sign

If your feelings are not reciprocated

You are no longer in it.

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But I prefer to see love as a choice. I wake up everyday and choose my partner. Feelings may fluctuate but Love can continue. Falling makes it seem out of our control.
However it’s also okay to choose to stop loving someone if it isn’t working for you.

You'll know.