One (inevitable) plot hole?

He didn't know he was a werewolf at that point. As a child, he thought he was just having nightmares. The priest told Reed's adoptive father that unconditional love could protect him from the curse, and so he made sure that he felt love every day of his life well into adulthood. So Reed had managed to spend the next several years of his life never transforming into a wolf again (the full moon would have no effect on him so long as he felt love). The night he was in the tavern was the first night he had been away from loved ones during a full moon, and his mistreatment at the hands of Christina's fiance and her father may have contributed to him not feeling loved. Thus, he transformed. It's only after this scene that he returns home, and his father, the priest and Teresa tell him what he is.

Had he not been thrown in jail and been allowed to marry Christina, he might have been saved. The night he spent with Christina, he did not transform. But being locked in the cell during the full moon allowed for his transformation.

Just the fact that a person can transform them self into a werewolf is a plot hole in itself

Being a werewolf was his identity: he couldn't (or wouldn't) deny it. Haven't you seen programmes about serial killers?