Why won't he get me a ring?

My boyfriend of 3 years asked me what I want for Christmas and I told him I'd like a ring. We've been together for 3 years and have a child together. I told him I would just like a ring, it doesn't have to have any real significant meaning as I do not want to get married but I do want something to represent our relationship that I can wear. He told me he understands where I'm coming from but it's too soon? I'm not exactly sure how it can be too soon when we have a daughter and we live together. Am I missing something?
Why won't he get me a ring?
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