upset

this should be my happy day ever because i was just had a very good time with someone <3. but someone other and somehow, has just made me upset and felt 'aaaarrrrrghhhh'
it was just begun when i asked a friend to do something urgent. my friend has promised to do it at 21th of August. but the truth ? almost 11 o clock, and my friend hasn't do what i want. even i tried to chat his/her*, but he/she* didn't read it. in fact, my friend could update his/her* status but he/she* didn't read my chat. until right now, i think my friend turned off his/her* phone so i can't contact his/her*, and fortunately, it was just pending.
then what should i do ? feel upset..

*) to protect identity and avoid problems.