AIO friends new boyfriend won’t stop demanding he is around her 24/7

Names are blocked for privacy. My friend “Sophia” got a new partner about a month ago and, ever since they’ve been dating, she hasn’t hung out with anyone, and her boyfriend doesn’t “allow her to”. She tells me to just mind my own business, but I genuinely get bad vibes. We’re both in high school. Her boyfriend was actually accused of sexual harassment, and was suspended, but she blames the girl rather than questioning her boyfriend's behavior. I don’t really know if I’m being unreasonable, but this just doesn’t seem logical to me… I also want to add that my friend Sophia isn’t cheating or doing anything where he would have a valid reason (IMO) to see where he would have a reason to distrust her. I'm also alarmed at the fact they've been together for such an insignificant amount of time (1 month) so I don't know. This is weird to me lol.