My boyfriend revealed that he was sexually abused as a child?

My boyfriend and I have been together for about a year, and from the beginning he told me that he had kind of a “rough childhood” and I know he went through a period of depression in college. He just recently revealed that this was because he was sexually abused from the age of 7–10 – he wouldn’t say much, just that he was fondled and forced into oral and anal sexual acts. He wouldn’t tell me who (He said “there’s too much at stake”), though I think from his answer it might have been a family member or close family friend. What I want to ask you guys is how should I handle this situation… I’m kind of afraid now that I’ve done something or will do something (on the intimate side) that’ll upset him or bring back unpleasant memories. I’m afraid that I’ll say something that will make things worse.