<human>: I was diagnosed with moderate depression and put on medication for the first time last year, though it's something I've struggled with my whole life. I haven't been in a serious relationship in a few years, but started seeing a really great guy about six weeks ago which has been a bright spot in my life.

He knows that I see a therapist, but I haven't opened up to him about the fact that I suffer from depression and am on medication, or that I have "what's the point?" thoughts every once in a while. When we're together I feel good; he actually makes me happy and we're active so that's all he has seen from me (smiles, laughing, engaging, etc.). 

That said, I know that sooner rather than later he's going to experience one of my down days and I need to address the situation before that happens. I want to be honest with him, but I'm scared and don't really know how to start that conversation.

Does anyone have advice from their own experience dealing with this?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Looking for advice on how to tell the guy I've been seeing that I suffer from depression/am on meds.