Was I wrong for what I said?

Ok my brother had this girlfriend for like 3 years. He moved her into house after I told him not to, there was just something about her that just didn’t seem right either me. My brother is a 26 yr old fireman and a good looking dude that gets ass wherever he go’s. So anyway someone he knows seen his girlfriend a few times hooking up with some other guy from a gym she go’s too. His friend got video of her with this dude and showed my brother. My brother got hurt but not all broken up and he asked me what do I think? And What should he do? I told him on your day off when she goes to work in the morning take all of her shit and burn it and then kick her out. Anyways, he did what I said and in return she told me it was my fault. because he always listens to me. I told her fuck bitch. She asked him “why did you do this to me?” He said you know why. And if I have to tell you, I’m going to have Red bite your ass now get the fuck out. Red is his 2 yr old Doberman pincher mean as fuck. A week later his back window on his new GMC truck got busted. Was I wrong for telling him what I would do?
Was I wrong for what I said?
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