Was this a threat or my girlfriend (now ex girlfriend) just being hurt?

I broke up with my girlfriend recently because there weren't sparks anymore and sometimes she would come out as nagging, too strong and somewhat bossy. I haven't been happy in the relationship for the last couple months.

During our break-up, she angrily said ''You are so gonna regret that. If I can't have you, no one will, no one.''

Was that a threat or her just reacting in anger and being hurt about the break-up?

Was this a threat or my girlfriend (now ex girlfriend) just being hurt?
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