His friends know about me and keep teasing us..?

We are in different cles but his friends know about me. I guess it all started when his friends saw one of my sms which i sent him. And they thought i was his girlfriend, but he just smiled and did not say anything. Subsequently, his friends used his phone to sms me mushy stuffs. They even wrote something saying that He loves me and pasted it in my cl. But he didnt seem to stop them. Is this because he thinks there is no need to stop his friends from saying something which is true? Or is it because he just takes me as a toy and is just toying with my feelings?