What to do

My boyfriend of 6 months has depression and bipolar issues and at times wants to break up. I usually am able to calm him down and he realizes he needs me I need him etc. But last night he said we're on a break. That he doesn't know if he still loves me and that he needs me as a friend right now. I'm fine with waiting for him to be okay with us again, but how long is too long of waiting? And should I try to do anything to keep him happy in this break time?