Gil having Grindr XD.
But probably yeah, Gil of all the routs has the best realeationship with Walter family. In his route he has some lines like "I really want to visit them. I dont do it since so long ago" So probably he had sex with Edgar, and with how Herbert is, he probably ear, see or knew it somehow.
WELL. Knowing how Walter is, he probably would just freak out a little and then focus on another thing.
But it deppends on who and how he got told. If its Gil, just talking seriously and relaxed with him, probably what i a said. But if its another person, and with a bad context, Walter probably would take it really bad.
I hope Andy make something out of it.