Am i being overdramatic?

So my bf and I have been together for 3 months. He has this female friend who posted a video of one of legs being in a guy’s lap (on his d***) and it just so happened to be my bf. I automatically went off on him, not intentionally. According to everyone I was being dramatic and they’re “just friends”. He’s a very sweet person so i tried to not assume it’s anything more than them being just friends. I let it go for the sake of our relationship and forgave him. But it’s still bothering me :/ The girl has his face plastered all over her page if i didn’t know him i would’ve assumed they were dating. When i confronted him about the video he said he saw no wrong in what he was doing. All though ppl are saying I’m making the situation more than it is i feel like if he feels like that’s okay, what other things could he be doing behind my back you know? Idk maybe i am just being dramatic. I know for a fact I’m the jealous type, how could i change this? Or at least not overact to him being around his female friends?