too busy

I've been busy for the past few weeks, first our 4th long exam, now the medicine week. I know i need to invest time for my career, but i also need to remember that there is someone I need to attend to, even only through sms. But it seems I'm not giving enough importance to that person, and I am wrong for treating her that way. I'm ashamed for what I have done, and I am really sorry. I don't know what is wrong with me, it seems I can't even pick up my phone when I'm doing something. I hope I can change for the good, and for the good of this relationship. I'm really sorry..i hope you can forgive me..I will try my best to give more effort and give importance to the person I value and love.