My boyfriends Bestfriend?

Kaylin • 😊😊
Okay I've been dating Brennen for a month or so now and we're really close and hang out almost every day but the first week we were dating I caught him texting a bunch of girls on this meet me app and he almost had sex with this (fake girl) bc I catfished him but him and my Bestfriend are Bestfriend and it makes me kind of uncomfortable. Should I be upset or am I over reacting ?