Class's object becomes null

The object of my class is becoming equal to nullptr and failing. I can't seem to figure out why.

I am trying to pass a string as an argument to a constructor of a class which has been defined by another team - Hello in this example. Hello class has defined a constructor which takes a reference string as an argument.

I am trying to initialise the object of class Hello in my class Abc and call the function print.

class Hello
{
    Hello(const string& email)
    {
        // initialises some values.
    }
    void print();
};

class Abc
{
    struct Options
    {
        string email;
    };

    Abc(const Options& options)
    {
        Hello hl(options.email);
        cout << "h1 initialised";
    }

    void callprint()
    {
        if (h1 == nullptr)
            cout << "NULL";
        else
            h1->print();
    }
};

int main()
{
    Abc::Options op; // for structure 
    op.email = "hello@world.com"
    Abc obj(op); // to initialise constructor of class Abc
    obj->callprint();
}

The output I am getting currently is:

h1 initialised
NULL

I can't seem to figure out why h1 is becoming equal to nullptr. In C++ class objects never become null by default right?

Earlier, I wasn't checking for (h1==nullptr) condition and my program was failing. What should I do to ensure that h1 is not a null object and I can call the print function successfully.

To reiterate, Hello class has been defined by another team. I can't modify it. I can make any changes to main and Abc class though.