Relationship

So I've been in this relationship with my child father since I was 18. We been together for 6 years and have two kids together. I am really not happy and feel like at times he doesn't understand. I talked with him a thousands times about how I'm feeling and how I'm not happy. Honestly I'm hanging on because he's the only one I been with, we have children together and we experience losing a child together... Idk what to do but I do know what I'm not happy and I want to be alone.