>>5 Emotions are not something so easily controlled. There are times when they come out involuntarily, and for a teenager, mood swings are a very normal thing, and they happen without any warning. Also, someone cannot simply "be normal," and sometimes people, when their emotions become uncoontrollable, say things that they don't like. Again, emotions cannot just be contained, and they most certainly do not heed commands.
>>1>>3 Yeah, it'd be best to not rush too quickly back into it. Relationships take time and effort. Keep bonding over the things you enjoy, and ask some questions about each other. Start with something really simple; what's your favorite color? Favorite movie? Even if you don't end up being with him romantically, I think it would be a shame if you lost them as a friend. You two sound very close.