Why did he have to choose me?

[Eliza24]

I am 23 met this 20 year old guy on Instagram in which I regret, he right away started flirting with me and then after we exchanged numbers and everything was going fine, he even came to see me one day and we spend the day together. A couple weeks after that he came to me house and i introduced him to my grandparents in which i also regret. He also wanted to have sex with me and me being naive i gave in i don't know why I truly hate myself for that. So after a few days he started thinking it was ok to talk to me any which way and when I told him off and told him talk to me with respect he called me a dumb broke bitch (I told him when we first started talking i am looking for a job because i was laid off and he said he had no problem with that) but i don't get it he didn't have to call me all that and he also told me that he finds me to be ugly in which i don't see how if when we first met in person he spend hours with me outside in public and if he really felt i was ugly he could have left and if he thought i was so ugly why was he willing to meet my family after. I come to find out he wasn't over his ex meanwhile he said she hurt him and that i was good for him and he liked that fact i don't have weave and i am natural and not stuck up. But it hurts because of all other females he could have pursued or should i say used why would he choose me? I don't like him anymore he is a dog but i sill can't get over the fact that i invited him into my home, and fell for his "nice character" in the beginning. He was the first guy i ever introduced to my family because i found him to be different which turned out to be a big lie and he didn't even apologize to me he just said i need to stop being a baby and no one likes me because im soft yet when I spoke my mind to him he got mad at me