Is my orchid dying?

[becca22]

I am engaged to a Chinese name and my name in Chinese is Bai Lan (White Orchid). I want to keep one alive! I have had at least 4 and they all die. I thought maybe overwatering but now my new one has rotten spot on its leaves that weren't there when I got it. I have not watered it, i've had it about a week and it was damp when I got it at a grocery store with a lot of others. I picked the one with the healthiest leaves (the only one). Please help me keep this one from dying I am usually very good with plants x(

attached is the orchid, and the leaf spots