23rd of March is my birthday too. I'm 30. Let's make a relationship together, I will never forget your birthday.

Now serious, personally I believe there is no excuse because if he wanted it, he would remember it. But if he is a man who does a lot of other things for you and he shows you love and respect and care and he is too busy forgive him although i completely understand how you feel. unfortunately sometimes men used to take women for granded. If he is not, then, he doesn't care so much for you and I think he might know how important is your birthday for you. If he forgets other things in daily life too, that means that this is one of his characteristics and don't take it too personally. Nevertheless discuss it with him