Tom and Sally have been dating for two years. Sally breaks up with Tom because he cheated on her with Betty. Sally tells her friend Kelly about Tom, but she tells her without showing any emotion. Tom continues to call Sally and treat her as he did when they were going out. Betty, who did not know about Sally, tells Tom that she is glad that he feels guilty for hurting Sally. She also tells him that it will take a long time to get over the guilt.
Tom is using ___________ as a defense mechanism.
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