Not exactly. It's complicated and he'll never tell you this himself, but since he trusted you with his secret...
[ she sighs. ]
Since vampirism is genetic in my world, it is possible... for one to manage to make those DNA strands dormant again. Which he did a year ago. He's only been a vampire again for a few months. He's always been very careful never to take blood from a living person. Part of the serum was something to help with the bloodlust and he's never been off it as long as he's been a vampire. I just don't know how this transition will affect him.
[ she was there when he transitioned both times. the first time had been awful, traumatizing for everyone involved. she doesn't want this one to be the same.