The Untouchable Ex Wife by Mizuki Sei

Meanwhile, Stefan stared at the computer screen in a manor not far from Everheart Manor. He read the email he had just clicked on and frowned, his gaze cold but also somewhat sad.
"Don't come back for the rest of your life if you don't want to?" Xavier sipped his coffee as he leaned over Stefan's shoulder to read the email. He chuckled when he saw who the sender was. "I'm sure Adie didn't write this. It sounds so angry... I'm sure it's Renee." "I don't need your analysis. I'm not stupid," Stefan growled icily. He had been living next door to Everheart Manor recently, watching the house secretly. He had emailed Adie to reassure the two children, and they had been keeping in touch, so he knew how his son wrote emails. He didn't need Xavier to point out the obvious.
"Stefan, why do you insist on hiding from everyone?" Xavier could not bear to see Stefan this dispirited, and tried to persuade him. "You should talk it out with Renee so you can resolve this conflict. If you keep acting like a coward, nothing can be solved. You're not usually like this." "She didn't do anything-it's my fault, and I don't want to resolve it." Stefan sounded gloomy. "If I wanted to, I could have just gone over and settled things." "What the hell happened?" Xavier had just gotten in touch with Stefan, and was still trying to figure out why Stefan had been avoiding them. This issue would never be resolved unless Stefan confessed to what he did.
"I don't have a problem, and neither does she. It all comes down to fate..."
Stefan clenched his fists. "It's not on the cards for her to be with me." "That's nonsense!" Xavier snapped in exasperation. "You're Stefan, the famous president of Hunt Enterprise. Is there anything you can't resolve? And as for fate... All I know is that our destinies are in our own hands!" "You're still young. You don't know how helpless we are when it comes to fate." Stefan could not tell Xavier what he'd done. He could only keep this secret until the day he died.
"No, that's not true!" Xavier stared at Stefan contemplatively, rubbed his chin, then asked boldly, "Could it be that I was right? There's something wrong with your male part."
Stefan was dumbstruck.
"Previously, Renee and I discussed the reason why you were hiding, and the conclusion we came to was that something must have happened that you couldn't talk about. Something must have happened that made you feel you couldn't face her... After much deliberation, I felt that the only possibility had to be a problem with your male part." Excited, Xavier kept talking. "You ran away from such a tall prison in the mountains, so you probably hurt yourself escaping, then you realized there was something wrong down there! And you have a lot of pride, which is why you're too ashamed to face Renee."
Stefan just stared at Xavier, speechless.
Xavier took Stefan's silence as confirmation and eagerly asked, 'Am I right? That must be the case, right?"