deleted messages hmm?

so my boyfriend works with this girl and i mean they text and its fine because i see what they are saying and its usually about the other employees or work stuff like asking questions or nothing serious at all. today i went on his messages to change my contact name and i look and he deleted their messages... like he NEVER EVER EVER does that but weird he deletes them tonight.. i honestly dont know if im trippen.. they are kinda close as in good friends. should i bring ut up? im the type of girl who will know something or find out something and keep it built up. i have a hard time of confronting people or him about stuff... some girls are straight up like "Wtf why did you delete your messages hmm" but im not that type.. i just will keep it to myself and let it bother me for years. lol idk i need some advice..