to confess or not?

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my cousin's love story is quite interesting and at the same time frustrating. three years ago, a great guy from highschool who she was interested in her told her that he loves her. at that time, she had a boyfriend (who was a total jerk) so she turned him down. time passed and she realized that she's actually fallen for that guy who professed his feelings for her three years ago. should she confess even if he doesn't show interest anymore?