My daughters boyfriend took her ring shopping and never proposed? Thoughts?

My daughter’s boyfriend took her ring shopping over a year and a half ago. She picked out her ring with him. He has not proposed. They have been living together for 3 years now. Says he wants to spend rest of his life with her. Seems fishy to me. She keeps making excuses for him.
My daughters boyfriend took her ring shopping and never proposed? Thoughts?
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