Man calls off wedding after his fiancée’s sister cut his beards while asleep

A young man has called off his wedding and broken up their engagement after his fiancée’s sister shaved off his beard while he was asleep.
He and his fiancée had dated for six years before their breakup and were engaged for a year before her sister decided to give him a new appearance.

The man who admitted to growing the beards for eight years claimed that he and his fiancée got into a fight when he told her he wouldn’t be shaving them for the wedding.
He said that while he was sleeping, he awoke to see his 32-year-old sister-in-law shaving his beard.
Sharing the ordeal on Reddit, he wrote,
“Myself (28m) fiancé (25f) who we’ll call Lexi are a happy couple of 6 years and engaged for 1 or so I thought. For context my fiancé’s sister (32f) we’ll call her Sally, has always been hostile towards me and would rarely speak to me and when she did it would be because her parents were around.
Sally is Lexi’s rock because she got her through a tough time during college and since then Lexi has told sally everything about everything. we’ve had problems with this in the past due to her telling Sally personal things about my childhood I’d only told a few people. wich led to us not speaking for 3 months during covid when she’d only leave our room for food and to go to the toilet, and recently we hadn’t had an argument in a year plus until 3 nights ago she mentioned that she’d like me to shave my beard. for context I have a very thick beard that I’ve been growing for 8 years and am very proud of so ofcourse I told Lexi I wouldn’t be shaving my beard to which she stormed off to the kitchen and slammed her wine glass into the sink smashing it and a plate in the process.
I immediately stood up and asked wtf she was doing, she then spun around and screamed that I’m a selfish a-hole because I won’t shave my beard and ran to our bedroom and slammed the door. I ended up sleeping on the couch and woke up at around 4am to sally with a razor trying to shave my beard so I pushed her off me. Lexi then ran to check on Sally whilst I was looking at the big patch Sally had taken out of my beard, then I went upstairs and packed a bag whilst Lexi shouted at me for hurting sally.
I told her to f-off and that the wedding was off and walked out the house and drove an hour to my parents house where I’ve been staying since the incident. earlier today I got a text from Sally saying I was selfish for not shaving my beard because when I go down on Lexi it feels weird I haven’t replied to her. my family think I should break off the relationship but her family said I should just shave it all and move on. So what should I do and am I wrong?”