I was in a similar situation two years ago. There is no one to blame but our lack of experience. We did the same thing: no growth? let's code up some random new feature (which makes you feel like you are actually doing something, but you aren't). I also don't think we made a great duo, but I'm still friends with my co-founder and we both agree we were just wasting time and it was best to leave (yours will realize that soon enough).
My advice: leave. Yes, you will wonder about the "what-ifs", but you have a bright future ahead. For example, I started a new company a few months ago with a friend, and we have already grown way more in a few months than my last company did in two years, and we are growing month after month (despite $0 in funding and two YC rejections :)).
You don't need investors. Maybe find a job, try some ideas on the side, and charge for them. You might be surprised what you are capable of.
My advice: leave. Yes, you will wonder about the "what-ifs", but you have a bright future ahead. For example, I started a new company a few months ago with a friend, and we have already grown way more in a few months than my last company did in two years, and we are growing month after month (despite $0 in funding and two YC rejections :)).
You don't need investors. Maybe find a job, try some ideas on the side, and charge for them. You might be surprised what you are capable of.