The name you are looking for is Abigail Williams, the cunning and manipulative neice of the Reverend Parris who leads the group of girls in Salem to practise witchcraft with Tituba in the woods. If we look carefully at Act I, we can see that her feelings towards John Proctor go far beyond mere "liking." Instead, they border on obsession. Note that we are told Abigail asked Tituba to make a charm to kill Goody Proctor, presumably so Abigail would be free to marry him. Also, note the conversation that Abigail and John have in Act I when they meet over the prostrate body of Betty Parris:
I know you, John. I know you. I cannot sleep for dreamin'; I cannot dream but I wake and walk about the house as though I'd find you comin' through some door.
Clearly, Abigail is completely in love with John Proctor thanks to a relationship that they had whilst she was working at the Proctor household. Although she was thrown out of the house by Goody Proctor, she has not forgotten her feelings for John and has not relinquished her dreams of being together with him again. The emphasis on the word "know" above, especially when we consider how it is used in Proctor's confession later on in the play, indicates the sexual nature of their relationship.