[header] How to turn your best friend into your boyfriend [title] Figure out how he feels about you. [step] Just because you have started to feel differently about your friend recently doesn't mean that he has any clue what's going on. He may be perfectly happy with how your friendship is going, and not have any inclination towards changing your relationship at all. 
On the other hand, he may very well feel exactly the same as you, and be wondering about your feelings toward him. [substeps] Start noticing how he acts around you.