I'm set to get married to someone but I've been cheating with my childhood friend who is also married now. I can't that guy off my bed... He's so romantic and I love sex with him so much. I really wish I stop and get married to my guy. Pls how can I stop

How can I stop cheating and get married to my guy. I love to have fun but my guy stays too longer in me that I dry up n get bruised each time I have sex with him.