How or should I tell my boy that his brother asked me out?

So my boyfriend was not in school yesturday and he their no boys are able to get next like if their trying to get colse to me I mean real close but any he didnt come to school and the moring I nomarly seat in the court yard and his brother came up to me and ask me were was his brother said hes not here today or tomrrow he said oh than the bell ringed and I got was about leave and he reached for a hug I was surpised because he never ask for a hug so I gave one I didnt think anything of it we have second period togther so when class was over he was walk with me he asked me were did he go I said I didnt asks him that he said he could be out of school (f)ing with another girl he said you need another man like me so I just similed thinking how could he do his brother like that so the end of the day he walked up me when I walking to lthe bus loop he said your boyfriend not hre o show you affection I can show you affection you need another boy friend like me then he put his arm around me said is that a yes or a no I was speechless than he left because I didnt anwer him should I tell my boyfriend that he asked me out and risk messing up their relatship or just leave it alone