I called my boyfriend my ex-husbands name what do i do?

well to start off last night my boyfriend was over and i was making burritos for dinner and i was upset about how my ex-husband owes me money and about the awful message he sent me earlier and as i was thinking of this i asked my boyfriend if he wanted another burrito but instead of saying his name i called him my ex husbands name and i felt so embarred and ashamed of myself and immediately ran up to him and gave him a hug and said i was sorry.. he said it was ok and that he understands but i still feel i hurt him very bad and i feel horrible about myself because i called the person i love the most, the person i hate the most... i am the stupidest person in the world... what do i do now?