just disappears

My boyfriend will randomly stop texting me for hours and say stuff like "sorry was at the movies" or something like that. 
I never know what's going on, and he knows I freak out easy, so the fact he will just disappear, well, freaks me out. Today we were talk and around 9:30 he just stops. At midnight he texts saying he was watching Wonder Woman, is it wrong to want a quick text saying he's gonna be busy?