What is the meaning of "I closed my heart" from a guy?

Anonymous

A man I have just met told me that he closed his heart. He had loved someone deeply, but things went sour real fast, leaving him shattered and scarred, you know. It hit him so hard that he made a decision right then and there to protect himself.

So, what do you think about this? Is this guy just making excuses because he doesn't want me or do you really think there is no room for relationships in his life?

What is the meaning of I closed my heart from a guy?
What is the meaning of "I closed my heart" from a guy?
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