car wont start even after jump-starting it

[mithrandir92]

hello
i have a 2006 mazada 6. a month ago i got a new battery.
yesterday i noticed after parking my car for 3 hours that one of the dome lights was on (maybe for more than 3 hours..i dont know)
my car didnt start, so i had to jump-start it, then after 10 minutes i turned it off, and i had to jump-start it again! i kept it running for 25 minutes and then turned it off.
today my car wont start again!!
is the battery already dead?! or is something else?!