Helppp

Okay so I might sound dumb but please don’t judge. I was talking to this boy for a while and he was my first time. After the first few times he changed his whole attitude and started being so rude to me. I felt so stupid about my self because I felt he only wanted me for sex. Now, we don’t really talk and he only talks to me for sex and when I say no he gets so mad at me. I feel so stupid I tell him how it makes me upset that he only talks for me for sex and he doesn’t even care. It’s so hard for me to get over him and I just can’t even though I know he’s a complete douche. I feel so dumb that I can’t get over him. Any advice?