battery keeps dying

Using a voltmeter to check for parasitic draw might be flawed, as many meters are too sensitive and might show the leakage of the alternator including the RF suppression cap. And it might show leakage of just moisture. it doesnt take much

You want to modify your test. START with a large wattage bulb like a tail/ stop bulb and wire that in series with the battery ground wire. If it lights up you have a draw. You are doing this to protect your meter which comes next. Meter protection in current mode is often not complete. Put your multimeter into the high scale current scale and connec that in series as with the bulb. Decrease range switch "safely" to see how much current is being drawn.

BE CERTAIN you have checked things like the glove box lamp, any extra stereo equipment (like a power amp) or any other added accessories, and the trunk lamp