I want to break up with my depressed girlfriend
Do you want to break up with her because of her depression?
Yes, her depression is making me feel depressed, I'm tired of being with someone who's a drag all the time.
While being supportive of your partner is important, if doing so puts your own mental health at jeopardy, it can be better to end the relationship. You might be inadvertently making each other more depressed, and it might actually be best to break up. Make sure you aren't completely abandoning her, though, and that she has a support system independent of you.
Yeah I think it is time for us to stop seeing each other.
You have to do what is right for you. Your long term happiness is an important goal.