AITAH for helping my nephew check his balls?

So this happened the other day and my girl is still pissed at me.
My (not blood) nephew (M21) came over. I could tell something was bothering him but he seemed unable to talk about it. My wife left for work after about an hour leaving me and my nephew alone.
I was pouring us both a coffee when he out of the blue announced he’d found a lump on his testicle and his foreskin hurt. He was really upset by it and i could tell it took a lot to say something. (Hes normally very shy and reserved)
I told him he needed to go to the doctors and offered to go with him but he kept refusing. In the end I offered to check for him. He thought about it for a while and in the end said he’d feel better if i looked.
He stripped of his shorts and boxers, i checked both his testicles like I would my own, and at his request. Checked that his foreskin would retract. (It wouldnt and there was a very small lump)
I talked him into going to the docs to get them checked.
Que my wife coming home later, i told her what had happened (she knew there was something wrong with him). She did not react how I thought. She went mad saying im a pervert for handling another mans balls and penis and its worse as its our nephew. Shes now not talking to me and has told his mum everything thats happened. Shes then confronted her son (not about me checking) bit about him not going to her. I feel terrible. I thought i was doing the right thing
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