I'm bi &the girl I like asked me out, but I have depression problems &I'm not sure if I should say yes.?

So, the girl I like asked me out. I really do like her, but I have depression problems. It's hereditary, so a lot of the time it seems like I'm sad for no reason. Since there's seemingly no reason when I'm depressed, I wont tell my friends, so a lot of the time, if things are going well, I'm still depressed. Sometimes I feel like I NEED a reason, so I take things much too seriously on purpose, I cry &I start fights with the people I care about because it feels a little bit better since I can say THAT is why I'm sad. She doesn't know about my depression, but we're good friends with great chemistry. She kissed me once, but we never ended up dating because of some personal problems she had, but now she's ready to go out with me, &I'm not sure if that would be fair to her. What should I do?