We have have been best friends for a long . We used to text each other daily . I felt quite happy when I talk to him . I shared almost everything with him . He broke up with his girlfriend, he was quite upset with it . I was always there for him, so that he never feel alone . I always try to cheer him up. I always tried to be there when ever he needs me and he also showed a lot care towards me but then I don't know what happened . He started ignoring me as he now replies very late to my texts. He stopped calling me . I felt very upset. Then one day I got to know from some other source that he is now committed with some other girl . He always called me his best buddy. We werw quite free in sharing anything with each other but he not even care to tell me about his new relationship. Then he blocked me from his Facebook id and put me in some another id which he never uses. And know I always text him and he is not replying . Some days before he told me that he loves me , he cares for me , I'm so important for him but I'm not able to understand what kind of love is this and what about our friendship?? Now we share nothing with each other. It seems like I lose him. He says that he's quite busy these days but I know the fact that "there is nothing like busy, its all about priorities". I don't know what happened, imiss him a lot. I always think about him and got upset. I am feeling quite low now. I am feeling alone and also feeling as if someone has thrown me out away from his life :(
What should I do now ? Should I also ignore him ?

You back away and wait, possibly forever. He has made it clear (by omission) that he isn't going to be your friend anymore. Try not to feel awful about what he may think of you, which I doubt is anything bad. I'll bet dollars to donuts that his new girlfriend told him that he can't have anything to do with female friends. She may be jealous and possessive or she may just be normally unsure of what is going on between you, despite his assurances. Happens all the time.