Iterator for Matrix Native class class

Question

I wrote my own Matrix class with such fields (you can't use STL containers in it)

template <typename T>
class Matrix
{
private:
    T *data = nullptr;
    size_t rows;
    size_t cols;

I also made an iterator for this class:

public:
        class Iterator
        {
            friend Matrix;

        private:
            T *curr;

        public:
            Iterator() : curr(nullptr) {}

            Iterator(Matrix *matrix) : curr(matrix->data) {}

            ~Iterator() = default;
            ......
Iterator begin()
        {
            Iterator it(this);
            std::cout << *it.curr << std::endl;
            return it;
        }

        Iterator end()
        {
            Iterator it(this);
            /*Iterator it(this->data + rows * cols);
            if (it == nullptr)
            {
                return it;
            }*/

            return it;
        }

How can I properly write an end() method that would return the next element after the last one? I understand that using address arithmetic you can get the latter, but how can I do it in my code?