<human>: Can you give me the gist of the text in a nutshell?

Well, we've been together three years. Last year she was diagnosed with lupus. I've been nothing but helpful and supportive, but my efforts seem worthless. She has to stay cooped up all the time, because she can't be out for too long without feeling sick. I feel like any complaint I have is just a whine, because I don't have any real problems. The thing is though, she wants to get married, and buy a house, etc. but we're not to a point where we can do that. We're not even out of college yet. But every time she thinks about it she gets depressed, and I don't ever feel like I help. She has a good time when we get to see each other, but when I get home and talk to her in the phone, she's still depressed. There's nothing I can do to help her. I just feel so ineffective.
 
And her depression is depressing me so, I just need some kind words and a little advice.
<bot>: My girlfriend is depressed and there really isn't a thing I can do about it, and her depression is spreading to me.