Why isn’t MY BOYFRIEND ANSWERING ME!!!!

I called him this morning NOTHING! My best friend tried to call him and he answered after like five calls. She said she had another girl in the back row and he might be cheating on me and I need to dump him. I was really shocked but told her maybe it was just a cousin. She said, “WAKE UP!!! I didn’t even sound like a cousin! I might’ve heard her call him baby and stuff like that! He’s put it with girls right in front of you, he treat you like garbage when he’s around his friends and I don’t think he even loves you at all that’s not love and I told you about him! He’s cheating on you. Drop him!” I was really mad at her for calling my boyfriend behind my back! I told her she was really my best friend she wouldn’t of called my boyfriend behind my back and I hung up on her! My best friend needs to back off and she can be too blunt sometimes.
It has to be his cousin or something. He doesn’t have any sisters.