OCD, Relationship, and Mental Health

My boyfriend loves me for who I am and always reassures me that I'm perfect in every way but lately I've been being so hard on myself. He's always so good to me and recently I've been being "over the top" with my condition (OCD and I have moderate Bipolar)... I realize later in the day that I should've have done certain things, or said them or be so hard on him when it's clearly not his fault.. he always tells me that he loves me no matter what and that he can always handle me at no cost and nothing will ever change (I believe him).

My question is for those who suffer from either or both of these conditions, how do you deal with them and how do they effect your relationship on your side?