As of last time I've played it, there's a singular share scene on Jen's sub path and some light sharing talk/teasing on Lea's path. I never saw any cheating stories, but that's also probably because I stayed 10 feet away from Kim, so you'll have to ask one of her fans.
I certainly hope not. I've often criticized this before, his insertion into that path was one of the silliest character placements in the entire story, and felt like a sharp detour from the writer's otherwise sensible plotlines and character development. For those confused by what I'm saying, think about his backstory, and what we know of him prior to that point.