This answer contains spoilers… (view spoiler)[I wrote a character analysis of John Proctor for class, though I read the book because I wanted to. "John Proctor is a land-owning farmer in Salem. He has three sons and a wife. He had an affair with Abigail Williams, but chooses to protect his wife rather than preserve Abigail’s reputation. Mr. Proctor appears to be a complicated character. He does not condone lying in his professional life, but does so in his private life. He would do anything to save his wife, but is willing to hurt others and does not seem to love her in a way different from how an older brother loves his sister. Basically, Mr. Proctor is a strictly-moraled and fair man, but has a hard time following the principles that he sets for others." (hide spoiler)]
Christine Obviously, both of them succumbed to lust. Abigail is painted as the worse of the two because she would have liked to keep the affair going. John Proctor performed the horrific act of cheating on his wife, unheard of in Puritan society.