How do I NOT put my self worth into a romantic relationship? Because I learned in a breakup it's bad to put self worth into someone else's hands?

How do you keep your self worth for yourself and not put it into the relationship you're in and developing? I don't want to end up with another broken heart, and last time I did.

How do I NOT put my self worth into a romantic relationship? Because I learned in a breakup it's bad to put self worth into someone else's hands?
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