Husband on Tombstone

The husband went home alone to celebrate the New Year. He was supposed to come back on the eighth day of the first lunar month. But the Lantern Festival has passed, and he still doesn't want to come back. He kept putting off going home during the phone call, so I had no choice but to go to his hometown to look for him in person. I had not been to his hometown for two years after getting married, so I asked the villagers about it. I kept walking in the direction pointed by the villagers. He actually walked to the grave mound on the mountain. I feel unlucky and want to go back. Unexpectedly, I found my husband's photo and name on the tombstone. Upon closer inspection, it was engraved that my husband died five years ago. So who is the person I have been with day and night in the past two years?