Am I rude for telling my friend she's in the wrong?

My friend broke up with her serious boyfriend for approximately a month due to some misunderstandings. During this 1 month she was back on Bumble, but even when she got back with her boyfriend and had bumble on her phone. When I asked her about it she said that it's to find more male friends since female friends do too much drama. I was perplexed and disgusted but thought her boyfriend knew about it so let it slide in spite of my personal feelings. Well, few days ago her boyfriend found out about her account and blasted her for it. She was crying and begging for another chance, and that's when I found out that he had no idea she was on Bumble when they were together (She revealed it when she got drunk). After learning that I told her she brought this on herself by not being honest and basically cheating on him, and that he's reacting super mildly considering she's not blocked yet. She called me insentive and refuses to speak to me. Did I go too far?

Am I rude for telling my friend she's in the wrong?
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