Happy Birthday Gretchen!
Your boyfriend is a guy!! Men don't really remember birthdays, anniversaries etc... I bet he cares about you so much but the birthday thing just isn't a big deal to him, and because of that he may have forgotten. Did you tell him it was your birthday coming up? Give him hints and stuff?
My husband still forgets my birthday sometimes!! I told him afew days before and he actually said, OH yeah, I totally forgot! Thanks for reminding me! I didn't take it personally as it is just the way his mind works.
What you have to look at are his 'actions'. How he is usually? Caring, attentive, understanding, loving and kind? Does he do nice things for you and spend time with you? These are the important things you have to remember. Maybe he's had alot on his mind recently and had intentions of doing something but got side tracked.
Be honest with him. IF this is the guy of your dreams, your future husband then be completely upfront and honest with him. You should be able to tell him anything...Just as he should be able to do the same with you.
Keep posting and have a great day!