Why does cin >> ws make the program not terminate when there is a blank space at the end?

I made this program to see how "ws" works

    char character;
    
    while (true){    
        character = cin.get();         
        cout << character;        
        if (cin.peek() == '\n') break;        
        cin >> ws;
    }
    cout << endl;

The program works with inputs (I use '_' to represent blank space) e.g: A___________________B__________C

Result: ABC

However, if I put a blank space at the end (like this: A_____________B__________C_), the program never ends and when debugging I find that the line (cin >> ws) never ends. My question is why is this happening.