quick pointer question

#include <iostream>
using std::cout;
using std::endl;

int main()
{
    int *p1, *p2;
    //Alright, let's say we have two pointers.  ints for example

    p2 = new int(8); // And I decide to allocate and int in one of the pointers.
    p1 = p2; // Then I go about assigning a pointer to that pointer.

    delete p2; p2 = NULL; // Then I decide to delete it.

    cout << *p1 << endl;
    /* However, when I print the value in p1, it still prints the same data 
       I allocated in the other pointer.  How come it's able to use the data 
       that was allocated in the other pointer?  I thought I deleted it.

       Thanks in advance. */

    return 0;
}