My boyfriends best friend told me that my boyfriend was cheating on me, should I believe him?

Anonymous
so me and my boyfriend dated 4 about 16 months... and today I asked myself if he was actually cheating on me since I dreamed about it... the thing is I ask his best friend what he though of this and he said it was true. That my boyfriend had cheated on me a week ago. I broke up with my boyfriend throw the phone and when I told him it was cus he cheated on me he was very surprised... I hung up after that I really couldn't take it... anyways doesn anyone know if what I did was right?
My boyfriends best friend told me that my boyfriend was cheating on me, should I believe him?
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