I have developed a crush on one of my bestest friends... what do I do now??

Dustin used to be the guy I considered as the little dude with way too much energy that lived next door.. Now he has become the only guy I want to kiss and laugh with.. He used to irritate me with the consistency of his blurts of opinions but I would laugh because, well.. they were just funny (most of the time) and he also has no qualms about talking out loud about the issue of , etc.. I am conservative.. I don't throw my opinions out all of the time and I never, never talk about out loud because I don't think ladies should throw the issue around. We don't see eye to eye on very much, he likes the "country, i'm proud to be a redneck" ***no offense to anyone*** and I am "rave going, emo type". We do have similarities that are fundamental, we both work hard in this life, we both care about being a good person. It's like opposites attract hard core.. I don't know if I am going to say anything because I am afraid that he may not feel the same way. My my sister noticed how we act towards each other. She says he likes me, she says that when I am not paying attention, he is looking at me. I got sick the other day and he completely took care of me. He fixes things around my apartment, cooks for me and my teenager and will do anything we ask him to do. I think it may be more about the feeling of family rather then a budding relationship because he moved to OK from MO and has no family. He doesn't like his roommate. He spends a lot of time at my apartment but I think it is mostly because he is not comfortable at his own apartment. We did get a little drunk the other night and he was more affectionate than usual.. I was walking by and he grabbed my hand and made me put my arm around his waist from behind, like I was holding him... ULGH.. it's so frustrating but also exciting. Oh please give me your opinions about what you think this is and if you think I should say anything... I appreciate it.