We are moving too fast, he said?

We dated for three weeks until he started to get jealous and wanted go cut the contact off because he felt that we went to fast and he could not go on without having feelings. Now he wants to meet again to explain his reasons and wants me to understand him for acting like that. He said he wants to apologize and is sorry for hurting me. His best friend told me he never experienced that he was caring that much about a girl and that he was affected by realizing that things moved too fast for him.
Why is he suddenly that emotional and wants to break off contact? Should I accept meeting him again to listen to his reason or is he just going to excuse himself for having a clean conscience?
We are moving too fast, he said?
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