Self confidence

Hi I’m Thomas. I’m going to through a paragraph explaining what I’m dealing with right now. Feel free to give me any advice. Thanks!

Basically around 2 months back me and this girl were talking. Basically she just eventually started acting like dry or almost like awkward around me which really killed my confidence. After hanging out a few times we stopped talking. Now my friends just constantly tease me about this girl. Cut to today they like say some complex *** words that I had to look up the definition for. It basically said she still wanted me and called me out that the whole thing didn’t work out because of me. I don’t know how I should tell them that they are being bad friends by constantly reminding me and not supporting me. My confidence has lowered and I jus feel like I’ve screwed up someho