I have a plan b even though I have a stable relationship
What is your relationship plan B?
I'm going to sleep around since I don't want the relationship to be too serious
It's okay to have a back up plan for relationship problems. But it's wrong to cheat on a partner just because you don't want to be in a serious relationship. You should be single if you want to do that.
Okay, I am fine being single.
Okay great, so you will break up and then just sleep around as planned. Good luck.