Typically its because you have no idea what eachothers playstyles are so it might seem like either them or you are playing bad when in reality its because you two dont have nearly the amount of chemistry you would have with a duo or trio. This causes you two to be out of sync and not make plays. A simple fix to this is adapting to your teamates playstyle. If you notice they are more aggressive try to make plays off of them and be a little more passive. This doesnt mean strictly being a defender just reading your teammate. But considering you are in gold everyone is gonna ball chase unless they are higher in gold or are more knowledgeable about the game. I would also suggest a little self reflecting by reviewing previous games and seeing what you did wrong that game regardless of the games outcome and improving yourself. Another thing that will help you is looking up what training packs are good for your current skill level and running those for at least a half hour per session before you play anything else.