Helpless

I was diagnosed with bipolar disorder 3yrs ago.I felt releived,like i could finally do something about it.I had a supportive partner or so I thought.He loves me dearly but is unable to accept my disorder.His way of coping is to ignore it and it's killing me.When I need him the most he is never there.We have been together for six yrs and he says he is still unsure about committing,that maybe once i can control this(he can't even bring himself to say it)we can start planning for the future.I feel so helpless.How can I help  him understand ?