relationship help 😓

Okay so, before me and my boyfriend started dating he was "talking" to this girl. She is perfect beyond words, and the only reason that he didn't date her is because her parents don't allow her to date black boys. Now, he still talks to her a lot. It bothers me but I don't say anything about it because I trust him. However, I found out yesterday that she is his #1 best friend on Snapchat, which had previously been me (for 7 months). I know that it's just stupid Snapchat, but when I confronted him about it he acted like I had no reason to be upset. So I'm just asking if I have a right to be upset... I don't want to be that crazy girl friend but I've gotten cheated on previously and this just bothers me... help!!