I'm going to cheat on my girlfriend of 2 years
Are you serious? Why would you want to cheat on her?
The sex is boring and I want different experiences
If you think that you're are wanting to cheat on someone you should try and talk to that person. If you are no longer happy in that relationship you should leave because infidelity will violate their trust of you.
Nope, I'm going to cheat on her
That is a horrible thing to do. It is wrong to commit infidelity and to violate the trust of a loved one. You should end the relationship if you are unhappy instead of putting her through more pain.