Letting me down...?

I cant get this guy out of my head, Im constantly thinking about him Im sat here wanting to kiss him and see him. With guys and bfs before Ive always been intrested but never like this it feels much more intense than before. I wasnt intrested straight away and he was but I seem to have really fallen for him now, which is a suprise to me weve both told each other we like each other and he said what did i want to do and i said that it was up to him but im scared of commitment....he said he was too, Even though I'm scared I still feel like I want to be with him and know he likes me for me. But suddenly when I discuss doing something just me and him he suddenly keeps letting me down and taking all day to text back hes always making excuses not to see me and doesnt really seem that intrested in me anymore its always me contacing him if we ever do see each other. What have I done wrong....Was it too good to be true?? mwah xxx