When a man stops texting and calling you and uses busyness to make excuses for himself, is that the time when the relationship is over?

It depends on the situation. If you understand that he is really busy with something, then you should do your own thing and make time for the two of you to be together. If, he is not busy with anything, but he is looking for someone to If these excuses are used to perfunctory you, then there is no need to care. Just spend your time on what you should work hard on and live your own life!