I understand how you feel OP.
Yeah maybe your bf is really busy with school but he is
not too busy for at least a little contact with you, not if he really values this relationship. That is what you need.. it's all you ask for, and it's NOT asking too much. Give and take. It's even more troubling that you already had this issue with him in the past and therefore he is
well aware that bad communication does not work for you.
Good for you for standing up for what you need. We have to take care of ourselves because nobody else can be relied upon to do so.