Boyfriend's Brother😕

So my boyfriend and I have been together HAPPILY for 3 years now! And his older brother who is like my best friend, we can talk to each other when we need to or what not or need advice. He randomly tells me one day that he had a dream that him and I got drunk together and had sex. Is this weird? I feel guilty and weird now to be around my boyfriend because I didn't tell him his brother said this to me especially since he knows him and I are so close as friends and all but does anyone else have a idea why he would even tell me this? I feel like he may have feelings for me which is why I'm so  weirded out by it all.. 
Any thoughts?