Am I overreacting?!

Okay, so just before the clock hit 12am on New Year’s eve, my boyfriend went to take a photo of us on Snapchat to send to his guy friend - BUT chickened out when going to send it because he didn’t want me seeing his list of “best friends.” (He didn’t have to directly say it, us girls just know) SO I proceeded to set an example by showing him that I had NO problem showing him my Snapchat history. Which consists of my girl friends and HIM. I found his behavior SO shady. He was acting so nervous, then shows me his (after I had to persuade him into it), and all I see is 5 other women in his best friend list. What bothers me most , is that one of the women is a girl who was infatuated with him (even during our relationship ) and I kindly asked him to cut ties. He completely did, but yet he clearly didn’t take me seriously and now he went back on his word .... 😞

What do I do? Pls help a girl out❤️

***UPDATE*** He just blocked her and gave me is Snapchat password. He claims it’s nothing worth losing me over. Thoughts ??