9 year relationship 👫

So next month it'll be 9 years since I've been with my boyfriend. We are high school sweethearts and we got together young. He's now 27 and I'm 25, and I can't help but to feel that our relationship should be a lot more advanced than it is! I feel like we should at least be engaged by now, and not only that I feel like our arguments are the same argument from when we were children. Honestly I feel like very minimal growth is happening in this relationship. I'm thinking about calling it quits. Don't get me wrong I love him.. I do, but I am so tired of waiting for him to come around and waiting for him to get on the same page as me. I feel more like his mother and life coach than a life partner. I don't think I can do this anymore. On the other hand... What if walking away is the wrong decision? Will I ever love someone else like I do him? He's the only guy I've ever had a relationship with and I'm just lost 😕 any advice??