The 6 days break up!!

I started a relationship with a boy who told me that he love me very much...
I started with him on 12 April and ended the relationship with him on 18 April..
He just told me that he likes another girl now..
My heart was totally broken...
But I did not cry for him..
I feel that he was being playful or something else...
But if I think it negatively...
Maybe he was "use" by someone who likes me but i don't..
I told my best friends bout this and they also said that there is a possibility..
On the day we broke up, the stupid boy named Oscar and his girl-friends waited in front of the class I was on duty...
When I was going up the stairs,the girls came down..
they told me that Oscar had waited for me for quite a long time..
I wasn't shock at all by the way..
He did not say anything to me when I went my class..
Anyway,I am still a single now..