I've been in a relationship for about 5 years. Slowly, I've been getting more depressed, and I don't know if it's because my relationship with my girlfriend is bumming me out, or if the depression from having schizoaffective is affecting the relationship?

I love her, but I need more room to think on my own. I feel like when I'm with her for too long I don't have the adequate time to think on my own about life. I just wonder if I'm meant to be single. It's sad, because we're both attached to each other in other ways. I don't know where to begin.