Cheating???

So, my boyfriend left two weeks ago(he’s in the army). He has this girl bestfriend that he’s super close with. She’s super pretty too. I was having difficulties about how close they were and takes to him but he brushes it off and goes to hang with her to next day(posts pictures of them cuddling too) he’s never posted me before and he’s posted her. I feel like I’m a little too jealous. But a mutual good friend had told me the truth about the two of them(my bf and his bsf) and I’m truly believing it. But I have no communication with my boyfriend yet so I don’t know how to handle this. I’m posting anonymously so that no names or faces are involved:)