Was Given A Gift And Then The Person Died

My friend gave me an expensive gift 2 weeks before he died. He had this item for many years. He had wanted to marry me and make sure that I would get his pensions and be able to retire. Our relationship was very private and no one really knew the nature of it. He wanted to change his will and leave everything to me and make me the executor of his estate. I was worried this would be a lot of work, so I procrastinated helping him write a new will. In the meantime he gave me a few items and told me to sell them to help me out. Now he has died 2 weeks after he gave me the gift. Can I keep it or do I have to return it to the estate?