So this "friend"?

So time friend I ve had since elementary school has been spending all his time with his gf. He got dumped and then the next day he got another gf. Then a few hours later he got another gf. He seems to never be available with this one. He says he s busy or hanging out with his family but his Snapchat story says otherwise. We are on the same soccer team but he doesn t go to practices very often becuase he s "tired" or "not feeling well" because he has band. He s been getting on my nerve, but also my mom because I can t get to practice without his mom driving me, but she s driving them around. (My mom doesn t get off work in time to take me, and it s about an hour drive to my practice) We almost never see each other because we have different classes. I just don t know what do to do anymore. We were best friends and then he got desperate for a gf. What should I do/ tell him without him getting mad at me?