Am I being erratic and irrational?

Unic0rn

My sister started seeing this guy that she used to date In college. She dated him briefly in college but they broke up because he was already involved with an acquaintance of hers. He then left the school. They went their separate ways and since the she dated 5 other terrible men got married to one, had a child and divorced him. He kept reaching out to her via dms ever since with her ignoring him. He also met and married a woman 27 years older than him. 6 years later, they reunite and start dating again however, this time I am also around to see who this person is. So we three have been hanging out and I noticed some odd things about this guy. First of all he does subtle violent things like pulling my hair as a joke, squeezing my sister’s hands because she disagreed with him “as a joke” again of course, embarrassing me in public because I coughed after smoking basically getting angry and saying that I am wasting his weed, telling me that I should not tell anyone and handle things maturely when his friend tried to sexually molest me. Dropping my sister off at a mall halfway instead of dropping her home because he said he had to pay his workers. The worst one of all is that we all smoked some weed one night and before then he said that I shouldn’t do this with anyone else that they may try to rape me and he is my brother but when he got high he was touching me in inappropriate places in front of my sister and I resisted each time he touched me and she was mad at him and left the house. He first of all blamed her for ruining the vibe but when the drugs wore off he apologized and cried. I don’t think I will ever forgive him, I have distanced myself from him and I have blocked him on every social media platform. My sister however is still at his place and I don’t think this guy is good for her. He called me and I yelled at him to never call me again. I don’t want to reconnect with him but my sister is asking me to. Am I being erratic and childish in my reaction?

Am I being erratic and irrational?
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