As someone who has suffered from depression of varying intensity for 20+ years and probably a lot longer if truth were known, there is no quick fix and anti-depressants can take typical 4-6 weeks before they start to take effect, and sometimes if my personal experience is anything to go by can take a lot longer.
More often it is a long haul in which some people become totally well again in other cases it is just a matter of managing the depression and giving the person a reasonable quality of life.
I live alone so I can't give much advice on relationships. If you listen to Paula and Magie who are both in relationships and have children and go through the hell of depression, the support of their husbands gives them both tremendous help.
The last thing anyone wants who is suffering from depression is to be told they are making it up and it is there fault because they're not trying to get better because all that is nonsense.
It's an illness that can happen to anyone and more often than not doesn't even seem to make sense, when your mind turns against you, you end up continually fighting against your own mind which is exhausting.