Stay or leave

Me and my boyfriend been dating for four years. He is a nice guy, but since we been together I had to fight for his attention. He is a gamer and spend most of his free time playing video games. When we do spend time together, it's something he wants to do and only for a short period of time until he wants to get back to his games. Everytime we talk about it , he tells me that he doesn't think he can change. We have a son together so I want to make it work but lately I just feel like I'm the only one trying. I don't know if I'm just overwhelmed with everything with a new baby that I'm just thinking i should leave or should I stay. Any advice?