My boyfriend thinks I have What do I do?

So last year I had shingles from my son getting chicken pox and I had it when I was little but for some reason I got it again as an adult. They treated it with Valtrex and I didn't have to finish the whole bottle before it had gone away and I just never threw out the rest. Since then I've had a baby and me and the father broke up and now I have a new b/f well last night he slept over and in the morning he went to brush his teeth and noticed the Valtrex in the medicine cabinet. He asked me about and it and I explained that I had shingles now he thinks I have and isn't telling him. What do I do I'm afraid he might not call me or contact me after this thinking I lied to him. I am also embarred like I do have it when I don't. What do I say??