Today is the girl's birthday. I said I would spend the night with her, but I couldn't go because of something urgent. What if I ignore you now?

Actually, girls need to be coaxed. You promised him to spend his birthday with him yesterday, but you didn't go. It is normal for him to be angry at this time.

But if you have time now or later, you can go to him again, give him some small gifts, say some sweet words or just apologize and tell him what happened at that time, but now you want to make it up to him.

I believe most girls will understand, because girls must be coaxed. What she cares about is nothing but that you promised him but didn't come to him. He will think it's because you don't love him enough.

When you make it clear, you continue to look for him and give him some compensation. He will think that you are still very good and you still love him very much.