Is he talking to someone else?

Before we would talk all the time, flirt, goof off, he would make time to text me throughout the week and would uneccisarily apologize for not texting if we hadn't talked for a couple days. Now, it's like I'm a bother and he hardly ever talks to me. Did he loose interest or is he talking to another girl? I know it's not because he's busy since his social media is lit. Especially snapchat