Why does one switch only work when another is on? Leave a comment

I’m trying to wire up a living room light on a new switch. Prior owners ran wire from panel to outside lights first then back inside to the electrical box that contains the single pole switch. So I have tried to connect the neutral only to the new switch and tap into the hot wire from my outside switch. Doing this makes the new switch only work when my outside lights are on. Do I need a different switch? or is there anything else I can do?

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