Boyfriend troubles please help!!?

Okay so im 16 my boyfriend is 17 we have each others fb accounts and i was checking his messages and..he was talking to this girl we'll call her luda they were friends before we started dating..and they sorta had a thing for eachother and what he wrote was "we should bang xD jksss" we were dating at this time...im so sad he was the last person i ever thought to say something like this :( I know for a fact they didnt do anything..and they were going to go camping and he said "we are getting to get drunk and theres going to be girls there..whatever happens in camp stays in camp" i confronted him and he told me him and his friend were joking wen they said those things..they also talked about how my bf wanted to get drunk but didnt want to tell me, he told me a few days ago he wasent going cuz im not allowed me he told me how much he loved me and everything..but i still feel un sure :/ what should i do?