Man I'm dating is mad at me, what to do?

I have been dating a man for a month now, but not exclusively. For new years eve he invited me to spend with him at his party but i also had a family party I wanted to go to so I went to his party first and helped him clean up and drop off my liquor I got for him and then I left so I can be with my family for the countdown but after the countdown I was trying to go back to his party but my car was acting crazy and when I asked my brother to drop me off he said no so I spent the rest of the new years at home stuck in my bed. Ever since then he and my family hasn’t spoke to me and it’s been three days and because I left so early. I feel so sad and depressed what should I do.