Overthinking??

Okay so my man and I only have Snapchat as a social media. We moved like an hour and 45 minutes away from our hometown. Mind you we haven’t been to our hometown in weeks yet some girl from our hometown added him on Snapchat like two days ago.. 🤔 my question is how and why? I haven’t approached him about it because I don’t want to jump to conclusions what do you guys think ?