Just Not Romantically Into Someone?

Has anyone ever dated someone for a bit and then realized it was someone you were just not into romantically?

Not because they said or did anything wrong. It’s Just one of those awkward things where you can’t feel a romantic connection. And it’s frustrating because it feels like there is no clear reason.

You’d probably be best of friends… They’re super fun, wholesome and share many interests. But you’re not really seeing yourself in a longterm relationship with them.

How would you approach something like this with the other respectfully and delicately?