I think you owe an explanation as to how you went from fun hypomanic girl to depressed neurovegetative girl seemingly ( to him) overnight, how you're likely to cycle through these moods again, with how these particular mood changes don't have anything to do with how he's treating you. An explanation will be even more necessary if you are significantly more sexual when you are hypomanic then when you are depressed.
Some guys will bail if they know that you are clinically bipolar- To be honest I'm one of them in that I've already paid those particular relationship dues. Others may be more sanguine and others still will seek out someone to rescue. I think you have to provide enough information to let them make informed decisions if your moods or so insufficiently contained that you have breakthrough cycles.