Connecting 2 light fixtures with 1 switch between
To move forward, you should really take some time and do some learning about "switch loops".  Do not be experimenting blindly, understand the wiring!

You will not be doing this without either replacing one cable with /3, feeding the second lamp from the first lamp's position, or using smart switches and controllers. 

You cannot fake a 12/3 by pulling a single individual wire.  All related wires must travel in the same cable.

Your best bet is probably to convert all wires so they are always-hot and neutral, and then use a smart switch, which talks to two smart controllers associated with the lamp.   There are also smart LED "bulbs" like the Philips HUE which provide a similar functionality; their purpose is to control colors, but they'll also work just fine for on/off.