i need help

so recently, my crush’s best friend has been super flirty and stuff and has told me he really likes me and compliments me a ton and stuff and asked me to date and stuff.. i told him he wouldn’t like me long but he insisted that he would.. but this past week, he hasn’t talked to me much and when he has (even in meaningful conversation) he responds with one word.. i asked what’s wrong and he told me he’d tell me in a week (which will be this saturday) and he refuses to hint at what it is and won’t even tell me if it’s a good or bad thing or if i’ll be mad or whatever.. what could it be?? should i be worried?