Well... I obviously don't know the situation.
I have many girls who are friends without it being dating or sex
Even some girls who will sleep over at my place because we stay out to drink until so late, but we don't have sex.
So I'm saying, just because they have taken photo together or hang out, or drink together etc, it can still be friend only.
But it all depends on the person and the situation.
But also... You have been together short time and then he will go away some months. So no clue how serious he is then. You would know better than me.