It's hard to tell why someone isn't communicating at a distance. He might be too down to feel like getting back to you, or maybe he is uncertain about the relationship.

I'm bipolar and have been in relationships that I had mixed feelings about. It was very hard for me to separate my "legitimate" feelings from the emotional distortions caused by bipolar. He could be going through the same thing. Maybe he has been losing interest in the relationship, but he can't tell whether it's because of the depressive episode or some other reason.

I wish he'd go back to the doctor and discuss what happened when he stopped the antidepressants, but that may be beyond your control.

First and foremost, take care of yourself. Try not to let his issues become your issues. I think Psych Central is a good place to talk about your concerns and hopefully get some comfort.

It is normal to go through emotional pain when a relationship is in crisis, so I won't tell you to run and see a therapist right away. But professional help (if it is available to you) is an option if the situation really starts messing up your life.