My girlfriend uses emotional intimacy as a punishment. What should I do?

Whenever I express myself and I say something hurtful but needed, she then refuses to communicate with me and closes up on me. This goes on for months before she opens up again and then another conflict happens after which she closes up again.. how do I break this cycle? How can I make this work? She says she will never open up to me again because I only hurt her when she does. Help!
My girlfriend uses emotional intimacy as a punishment. What should I do?
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