Idk what others will say, but imo no. From my experience, someone who leaves you on read is either busy a lot, doesn't wanna talk, or hates you. If it's the latter, he didn't wanna date you or be your friend anyway.
I can say that I don't remember my girlfriend ever leaving me on read. If she did, she was busy, and she would respond as soon as she could.
this sounds a lot like my sister. now, she is 14, but I'm not calling you immature. I mean that it sounds very similar to her and she has borderline traits but she is also autistic and I heard that her case can't be diagnosed until she's an adult, but it does sound like her.