Am I over reacting about my flashbacks of him?

So I met this guy when I was 14 and I’m 19 now, since I met him he would pull at my hair, grab at me, get his sister to try to talk me into hooking up with him, lure me into his home by bribing me with money in the middle of the night when I was 17, make several accounts to try to get on my page, screen record our convo and say he’s going to send it out to people accusing me of being a prostitute at 17 years old as he was about 19, and he got arrested because he broke down his sisters door and hit her repeatedly in the back of the head while holding a knife, it was posted to the news so that’s how I found out. I saw him again today and I told my adoptive mom that it was him and she told me “he’s probably thinking about how attractive you are.” Which for some reason sent me into a rage because whenever I tried to tell anyone about anything growing up they always invalidated it and didn’t care enough. My biological family has ptsd and I had a few symptoms too growing up which when I told my adoptive mom she couldn’t even say the word yet alone know what it was.

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