Is it a threat to say, "If I can't talk to her, I'm telling everyone that she cheated on me" if it's true?

Question Details:

Been dating a girl a long time. She cheated on me. And I just wanted to talk to her. But her parents cut contact, against her will. I sent a text to her, knowing her parents would read it. They're more worried about her reputation than her.. so I figured it strike a chord. Apparently it did, since they are putting a restraining order on me (she's a minor, so she has no say). Is what I said a threat? And how serious is it?

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