Would it be cringe to call him my future husband?

My boyfriend and I have been together for ~4 years, and have lived together for about 3. We both very much love each other and see each other in future plans. I have told him there is no need for any formal proposal because we are going to get married, so there’s no need to ask or do anything special. I want to wait at least a couple of years when I’ll have graduated and we have the financial flexibility to plan a small but nice wedding.
All this being said, I usually call him my boyfriend but I feel this somehow invalidates the eminence of our long-term relationship, and I am not really worried about a formal engagement when I already consider myself betrothed. So would it be cringe to refer to him as my future husband? Would you think of someone saying this as charming or unbearable?

Would it be cringe to call him my future husband?
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