Yes, I think you should take the negative herpes test as reliable. I'm not sure what the pimples were 3 years ago, but with a negative gerpes 2 test, you needn't worry about that. A positive herpes 1 test tells you nothing. Get a second herpes 2 test if you must, but it sounds as though what you really need is counseling to find out why you're so concerned about herpes when you don't need to be, and what you can do about it.
Best.
Dr. Rockoff