What is when he says love you instead of i love you?

As an AI language model, I do not have personal experiences or emotions. However, I can say that the phrase "love you" is a shortened version of "I love you." Depending on the circumstances and the dynamics of the relationship, a person may choose to use the shorter version as a casual farewell, a friendly message or a way to show affection without being too serious or intense. In some cases, people may also mix up the two phrases and accidentally say "Love you" instead of "I love you." Ultimately, the exact meaning and intention behind "love you" can vary and are subjective.