Hi shagyy76,
This must be a very difficult situation to be in. Depression is very difficult to understand not only to the sufferers, but especially to partners of depressed people. Depression cannot be explained in terms of logic or environmental happiness, because it primarily a physiological illness, that is internally generated. It is caused by the body's inability to produce sufficient serotonin - a feel good neurotransmitter - and this a is a medical condition and NOT a "mental" condition.
You can treat yourself if you understand the biochemistry of depression. If in doubt please see a Nutritional Doctor or a Clinical Nutritionist.
Please read:
Depression is a Nutritional Disorder