If I have this simple program where I add and store pointers in a Map,

struct MyStruct {
    int value = 0;
    std::string str;
};

int main()
{
    std::map myMap;

    MyStruct* obj1 = new MyStruct{ 5, "Test1" };
    MyStruct* obj2 = new MyStruct{ 17, "Test2" };

    myMap.insert({ "key1", obj1 });
    myMap.insert({ "key2", obj2 });

    // Delete obtained object
    MyStruct* obtainedObj = myMap.at("key1");
    delete obtainedObj;
    obtainedObj = nullptr;

    if (myMap.at("key1") == nullptr)
        std::cout << "Confirmed\n";
    else
        std::cout << "Old value\n";
}

The Visual Studio Debugger shows that after I delete and set to nullptr the obtainedObj variable, even though obtainedObj becomes explicitly set to NULL, the Map's value for that key has not been changed to NULL. Also, if I check the Map's value manually, it does not satisfy the nullptr check. Am I doing something wrong?