We decided to break up mutually because of things related to our future but he messaged me after a few days and said he wants to try more even though it’s hard but he loves me so much and can’t let go. However he said he had sex with someone else during our break up and was disgusted right after and regretted it. I love him but I don’t know if I want to be with him after he had sex with someone else. How could you be in love with someone and have sex with someone else. What do you think?