I have the option to cheat on my boyfriend tonight
I hope you aren't serious. Why do you want to cheat?
Because I think doing it will make me feel good.
It is a bad idea to cheat on your boyfriend. Even if you think it will make you feel good now, it is likely you will regret it later. If your boyfriend finds out, he will be hurt and may break up with you.
I'm not cheating, I'm making the choice to enjoy my life. Besides, I can't just sit around at home doing nothing.
Cheating is still wrong. If you feel bored you know you can get a job and have something to do during the day.