Good question. I tend to be honest but tone it down a bit as my boyfriend has anxiety issues and would freak out if he knew how I was some of the time. My moods are constantly changing and it would be a rollercoaster for him to keep up with it all. He is not dumb though and does notice the swings more often than not. Of course if I am really bad, or in danger of harming myself I do tell him so he can help keep me safe, or take me to the doctors/hospital. At the moment I am falling into a mixed state so I have told him so he is aware things could go south quickly. He is very supportive and helpful. I am so lucky to have him.