AITA: I’m deliberately skipping my nephew’s wedding because I don’t approve of his fiancé?

Context: Back in 2020, my spouse and I was visiting family and my nephew (through marriage) came in with his now fiancé. We started playing a card game and when my nephew beat his fiancé in the card game, she goes off and full force punches him in the ribs. Everyone else started laughing while my spouse and I were looking at each other shocked. Later on, when they weren’t around, we brought it up that what happened WAS NOT okay in any way. My SIL stated, it happens all the time because the fiancé “just had her medication adjusted, but she didn’t mean to do it.” I’m like, WTF? Just because her medication is being adjusted, that makes abuse okay? As a result, when my nephew announced he was going to marry her, we’ve decided, we’re not supporting this marriage. AITA?
AITA: I’m deliberately skipping my nephew’s wedding because I don’t approve of his fiancé?
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