Did I upset him? Is the trust gone? help?

Well, I have this boyfriend. Im so in love with him. I was d in August, and I told him about it last week, finally. But I lied before that and told him I've never done anything ual. He understood why I lied though. The still haunts me (yes 3 months later) even if it was'nt all that tragic. I started cutting myself again because lately I've been thinking more then usual about it. He saw the cuts and asked me why yesterday. I didn't tell him why until today. Ever since he saw them yesterday, he keeps lifting up my sleeves and things. I'm not going to do it again, but he's not believing, and I think he thinks im lieing about the reason I was cutting. What can I tell him? I don't want him to think im a lier?