Forgot BF's 31st b-day untill 10am

Maggie
So I forgot his birthday untill 10am, I can't call him at work so I just emailed him. We had previously discussed celebrating Saturday. And I want ed to take him to a really expensive restaurant and he said to just buy him a cheap grill and we could grill on Saturday(we just spent thousands going to Costa Rica over the past weekend, it's wed. So he wanted to keep it inexpensive). He is now mad I didn't wish him happy birthday and suprise him 1st thing in the morning. Now he wants to hangout by himself, not speak to me, and go out to eat by himself. He is 31, is he over reacting or am I a shitty person? I'm not sure if I should try or just give up at this point.