What does that mean?

Anonymous
So, on Thursday, I didn't go to school because I was sick. And my guy friend went on a trip to Bali. When my friend went to the canteen, somebody asked his friends why he didn't come to school. So for the reply, his friends told the guy who asked, "He went on a trip; maybe he took (my name) on the trip as well." Then after that, my friend told them, "No, she is sick; she is resting." Then again, those boys said, "Who knows, both of them didn't come to school today, so maybe they were on the trip together."

Again, my friend smiled and kept it cool. After that, they said, "Oh, I have to tell (my guy friend's name) that she is sick."

Actually we all are friends, his friends and us.
And that's what happened, and I want to know why they teased me like that. This is not the first time that they teased me with my guy friend.
What does that mean?
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