I'm married, but I still fool around.
Why would you mess with someone outside of your marriage?
I really want to end my marriage.
It can be easy to fall prey to temptation to cheat, but we need to resist such impulses. When you marry someone, you make a vow to be faithful to them. Cheating on them breaks that vow, and it's also hurtful to your spouse.
I'm going to cheat more.
I think that it is so wrong of you to cheat on your spouse. The right thing to do would be to leave them so you do not end up hurting them even worse.