Highschool gay crush?!? Please help?

Ok so im a guy and i have a really really big crush on this other guy at my school. I told one of my friends an they told everyone at school... I just denyed it... The there was a cl talking bout me and my friend got tje guy i like out in the corridor and said tht i am straight and sorry i dont like him because it was a roumour. Then that guy kept sying no no no its ok if u do... He has a girlfriend but someone said he is bi :/ so im really confused and i cant get him outa my head its getting me really sad... We dont even talk but i just really like him badly :( i dont know what to do.