Am I crazy??

I get so mad when I see my boyfriend’s best friend list on Snapchat. I trust him, but I don’t trust the girls on that list. All except one of his best friends are girls. His second best friend is his ex & his fifth best friend is his other ex.

Is it unreasonable that I’m mad about this? I’ve talked to him about it and he just gets mad. He makes it seem like I don’t think he’s loyal, but why else would he be talking to all these girls?