Great sex

I’ve been sleeping with my best friend who is my ex’s brother … it’s been going on for awhile at least a year maybe two 😔 but it’s just sex nothing else we can still be weird around each other and still act like nothings changed in front of everyone … no one knows except up and let me tell you the sex is great it’s like passionate and he knows all the rights things to say and do . I absolutely hate when he kisses me during sex because kissing is so intimate and I kinda like it when he does … idk how do you stop having sex especially when it’s the best sex I’ve ever had … am I a bad person ???