Gambling can be stopped with will power and self control. You do not need therapy combined with other treatments, simply act like a responsible adult.
You sound so confident, do you have any study history that therapy don't help subdue gambling addiction.
If you are too responsibly minded not to pay attention that others are nothing as such, you should know that being an adult has nothing to do with restraining from addiction, have you heard the saying, "Spirit is willing but the flesh is weak".