My brother recently got a girlfriend. He doesn't spend time with me anymore.?

My brother and I used to always hang out. It seems like he just wants to hang out with his girlfriend these days. I understand he loves her, but does he have to be with her all the time? It's like he has forgotten me. He only talks to me when he needs something. My parents make me go places with him and his gf. When I do, I'm usually the third wheel. They forget about me on the way to wherever we are going. He was my only person to talk to. Now, he's too busy with his girlfriend to even care.