It's quite possible that she could cure your depression. I've been in a great relationship for six months now, and I've lost a lot of my depressive tendencies, I'm generally more upbeat, happy, and positive, and I even lost 50 lbs. If you like her, and she likes you, then go for it. Just be cautious, though. Don't give too much of yourself at once or you might set yourself up for heartbreak if it doesn't work out. She may just be the mental enema you need to feel good about yourself again, or even to have something to live for.