It's important for you to understand the difference between actual clinical depression, which is fully treatable with medication, and depression as a symptom of personality disorders, which is not.

I don't know if you have ever dealt with the latter, or if perhaps you are part of that group, but encountering someone who is can be enough to turn you away from ever potentially being involved with anyone displaying depressive symptoms. There's just too much risk to one's personal life and well-being if they end up being the "bad" kind of depressed person, and not the "good" kind.