Am I wrong for telling my boyfriend to stop obsessing over some guy I rejected in school?

My boyfriend told me that he's going to make sure the guy I rejected in school has his life destroyed. I told him to stop being so immature, and he accused me of defending him. I told him that I rejected him in SCHOOL, and he didn't know that I was in a relationship, and now that I'm in college he really should let this go ( it happened 2 or 3 years ago). He accused me of defending him and now is suspicious I was cheating on him. Am I wrong for telling him to stop with this madness?

Am I wrong for telling my boyfriend to stop obsessing over some guy I rejected in school?
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