Should I leave him

I asked my SO to help me out today because I have caught a cold and an ear infection. We have a month old and so I asked him to help me out. And he made plans to go and join his boys in a crawling event that’s being put on all day. He hasn’t helped out at all during the night or day. And I’ve had it. I am ready to pack me and her up and leave while he is away. Because this is rediculouse. Am I overreacting? Am I making the best decision for her? He picked his friends and toys over us. Am I seeing it wrong?