One of my best friends likes me, I don't like him?

I'll call him Bob. Me and Bob are really close and always have fun hanging out with me and "Lindsey" and "Billy", Lindsey always uses Billy as a pillow and i always use bob as a pillow and its never awkward, we're all best friends. But just in the past few days theres been this big secret that i get to find out tomarrow and its bobs secret and Lindsey kept saying he HAD to tell me. Billy and Lindsey keep making cracks about how we're the perfect couple and exchange glances whenever me and bob are talking. Billy asked me if i liked bob and he Lindsey said me and bob need to get a room and bob cut her off and said "Friday!" and thats when i find out the big secret. I'm positive that he's going to tell me he likes me. But he's like my brother. I love him but not like "that" i can't ever imagine us going out. I never thought he'd even like me. What do I do?