I said I love you he replied, that's good, does that mean he doesn't love me back?

Dating 10 months, first time I said it, he replied, "I know". Said it a few months later he said "That's good". Where do we go from here, he has said i am his world, but I am assuming he doesn't actually love me. He has had trauma in the past, but I can't believe that is the cause of his reluctance. I can only think he is unsure of me.

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I am female he is male
I said I love you he replied, that's good, does that mean he doesn't love me back?
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