Given the following context:

Living in Manhattan, Tom is a cook who has difficulty keeping a steady job. His wife, Sofia, is an attorney. When their first child is born, they agree that she will be a full-time mom and he will work hard to get a promotion. When Tom gets fired after defending his friend Paco, he takes a job in Ohio working at the ad agency where his father-in-law is the assistant director. Tom is assigned to report to Chip. Chip is a strict and hard-working paraplegic man who is coincidentally Sofia's ex-boyfriend from high school. Chip still carries an obsession with her, so he conspires to make Tom's work life miserable. As Tom's frustrations mount, Chip begins to sway Sofia to his side.
Tom begins to suspect that Chip isn't handicapped at all and goes through his desk. He finds a photo of Chip playing tennis and rushes to his in-laws' house to see his wife and show her the picture. He finds Chip having dinner with Sofia and her parents and holding Tom's child. Tom mercilessly tries to prove that Chip isn't actually paralyzed by dragging him up a flight of stairs and then throws him, expecting him to stand up to prevent falling. Chip doesn't stand up and Tom is humiliated in front of his family. Later, he confronts Chip outside his house and attacks him, where Chip reveals that he really can walk, but can't fight outside of his chair. After sitting back down, Chip beats him severely and reveals that he plans to sleep with Sofia, much to Tom's already-increased rage.

answer the following question:

Who's wife did the paraplegic man date in high school? 

Tom