why does current like circulating?
Let me turn the question around. "How much current do you think should flow through R2?"

No current flows because there is no potential difference across R2.

Another way of looking at it is that if current did flow somehow that there would be an imbalance of charge which would cause current to flow the other way. Imagine that (conventional) current flowed from left to right through R2 then the left side would take on a negative charge and the right side would take on a positive charge. That would create a potential difference or voltage between the two sides so the current would flow from + to -, that is, from right to left. The result would be that the voltage and current would fall to zero.



A water analogy might help. The two voltage sources in your diagram would be replaced with circulation pumps. Water will be pumped around the V1 R1 loop and around the V2 R3 loop. Water can't go from one loop to the other as there is no return path.