How should I tell my boyfriend I have depression?

I have been dating my boyfriend for 8 months now, and I love him. I am concerned that if I tell him I have depression he will think he is at fault for not making me happy enough. How can I tell him I have been diagnosed with depression without him blaming himself? Furthermore, I am worried that he will question how I can love him if I don’t love myself. I really don’t want him to question my love for him, because I do truly love him and he does make me happy.