What would you do?

I just recently had a bby. He is 4 months old. My baby’s father has two other kids. It seems like he does everything for them. I don’t really see that what he does for them the same he does for our son. He stated one time that he loves his other kids because their mother is really a mother shes just a little girl that hasn’t grown up. That my son has me who will love him etc. He helps out his other children when they need diapers wipies milk etc. We been have problems witch we aren’t together and all I asked him was for diapers. What would you do in my situation? It breaks my heart that he does everything for his other kids and for my son all I asked him for was for dispers?