What does this mean??

So I’m laying in bed w my bf and my parents were gonna be coming home soon so I told him he had to leave. I tried pushing him and everything to get him out of my bed but he wouldn’t get up (he was goofing around btw). Then I grabbed his phone and walked out of my bedroom and he jumped outa bed and ran after me and was fighting me for his phone back. (not literally fighting but uk what I mean). My issue is what’s so important on his phone that he did all that to get it back? Don’t get me wrong Ik it’s his phone and his privacy but we’ve been together a year and he never rlly lets me on it. (Btw I’m 16 & hes 18)