The appellation of daughter-in-law can have many different meanings, which can refer to a son's wife, wife, servant, married woman, or a modest title of married woman. When a man calls you daughter-in-law, it usually means wife. Especially in northern China, many men like to call their wives daughter-in-law. If a man calls himself a daughter-in-law, it may be the following psychology:
1. During the period of love, the boyfriend called himself his wife. That's because in the boyfriend's heart, you have been regarded as his other half, and your relationship has reached a certain level. He regards you as his marriage partner and hopes that he can marry you, which can be said to be a nickname.
2. If you are husband and wife, then a man calling you daughter-in-law actually means wife. You are his wife, and he can call you daughter-in-law appropriately.
It is also possible that men call your daughter-in-law just sweet talk. In his mind, he doesn't really recognize you as a daughter-in-law, but just wants to please you or Doby.