Both "I love you back" and "I love you too" are appropriate responses when someone says, "I love you." The choice of response can depend on personal preference and the dynamics of the relationship.
"I love you back": This response directly mirrors the other person's expression of love. Some people prefer this response because it reaffirms the sentiment expressed by the other person and emphasizes the reciprocity of feelings. It can be particularly meaningful in a romantic context.
"I love you too": This response is a common and widely used way to reciprocate feelings of love. It is simple, straightforward, and conveys the same message as "I love you back." It is also suitable in various relationships, including friendships and family relationships.
Ultimately, the most important thing is to respond genuinely and sincerely. Choose the response that feels most natural to you and aligns with your true feelings for the other person. Both responses convey love and affection, and the specific wording is less important than the emotion and intention behind it.