Am I crazy for being jealous here?

Recently come back off holiday from Turkey, whilst I was there I hooked up with a few Turkish guys but have kept in contact with one. We have been talking a lot and sometimes face timing when we have the time, he is due to come to the UK in just under 3 weeks, I have my own place so he’ll probably be there quite a bit. I have been home since being back to catch up with the parents and my younger sister (I hate going home) Anyway whilst I’m there I caught my sister stalking his Instagram, which instantly pisses me off and then I see her screenshotting his pictures and sending to her friends saying how hot he is. Now my sister is very much a bullshitter and will say anything to get a tiny bit of attention, she is pretty much a “pick me girl”. I’m genuinely pissed at her for doing this but obviously I’ve not made it clear as I don’t really want my parents to know I was being a slut (my sister found him as she constantly stalks who I’ve recently followed) I’m now in the debate of not letting him leave my bed once he gets here, keep him to myself and away from her bullshit, gotta make sure she doesn’t scare him off lol.