What does it mean when you and your bestfriend (guy friend) think alike?

Me and this guy have been close for years we had a thing for eachother. We just started talking again recently. And he told me 3 similar things he's been thinking of now and for the future that he wants. The funny thing is I've been thinking the same exact things. That kinda freaks me out a little lol but that happens sometimes. Sometimes he knows how I feel and what I wanna say. Lol why is that?