He regretted that night of kissing the person with whom he'd been friends for so long; he didn't have any trouble telling that person everything.

The two of them had been friends since they were toddlers living in the same orphanage, an attachment that endured into adulthood. After he kissed the person, the person tried contacting him; initially, things got awkward. Ultimately, though, on a rainy night, the person confronted him in person, knocking on his door.