Should I tell my friend I found out her boyfriend is sending messages to his ex?

I know obviously I should. But how? How do you break your best friend’s heart like that. And how do I even say it? What if she doesn’t believe me? And I really don’t want to tell her over text, but the next time I see her we are going to parties and I really don’t want to ruin her night. I also have no proof and don’t want to be accused of stirring drama for no reason if people don’t believe me. (If you’re asking how I know my sister is friends with his ex)
Should I tell my friend I found out her boyfriend is sending messages to his ex?
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