I'm 17. Recrntly found trp, lifting, improving myself, managed to land my first plate.

Enter, hmm, let's call him Joe. Joe and I are in a lot of the same classes, but he's basically the defacto most popular guy at school. Honestly, even though I hate him, I have to admire him a bit: three-sport athlete (swimming, water polo, tennis) who is also in all the hardest classes, the most popular guy in the school, and an actual investing genius (won't go too much into detail, but he made a killing with bitcoin). I got the feeling he liked, or at least didn't hate me, because he was always friendly with me. That was until I actually tried to start improving myself. He was never openly hostile, but he started making subtle roasts. I mostly held frame and ignored him.

Yesterday, I went to a party. My sister, let's call her Ava, (15) wanted to come, sure why not. Joe was there as well. Got caught up gaming this chick there, when it was time to go I tried to find my sister. Found her literally Joe upstairs. So yeah. Didn't know how to even feel about that, so I backed off for the time being, and texted him this morning. The text was literally 'so you and ava, huh?' I dont even know, I guess I was just feeling protective.

He finally responds saying that he doesn't give a fuck about my sister, he just wants to mess with me.

So wtf is this guy's deal? And should I show my sister those texts? Will she even believe me?