Why do guys lose interest in me?

We got along well, we flirted, he seemed into me and he just stopped talking to me. He began ghosting and avoiding me. I remember one day one of his friends started talking to me and he sees his friend with me so he comes over and starts talking to them. I don’t know why but he’s not into me anymore but didn’t want his guy friends getting to know me either. They step aside and I hear them talking. They’re whispering but they don’t realize how loud they are. I hear the guy I liked say something about me. I think he called me weird or something but I don’t remember being weird around him. Or maybe I was. From the looks of it he still finds me attractive but it seems he’s not interested in getting to know me. It’s like now he only wants to get in my pants.
Why do guys lose interest in me?
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