My girlfriend said: "I thought travelers burned out all my passion." What does it mean?

This sentence means that the girlfriend feels ignored or left out, and may be disappointed or hurt in her interaction with someone or some people.

"Traveler" usually refers to the people you meet in life, including friends, family, colleagues or lovers. In this sentence, "traveler" may refer to her partner or important friend, which dampens her enthusiasm.

"I thought the traveler burned out all my enthusiasm" expresses that the girlfriend originally had high expectations for this person, but was ultimately disappointed because this person did not respond to her enthusiasm or care. This may be because the other person is not paying attention to her emotional needs or not giving her the attention and support she expects.

In short, this sentence expresses that the girlfriend's emotions are hurt and she feels ignored or left out. If you are in a relationship, you can try to communicate with her, listen to her feelings, and give her as much support and attention as possible to help her regain her enthusiasm and confidence in life.