hm, even without a secondary phone (unless you're in some high tech company or so it'd usually be suspicious rather than never getting rid of your old phone after the past update), i guess there's prolly ways to hide some messages if ppl do have affairs
tho wonder if the 'affair partner(s)' will show up and see mc and be like "oh so you're cheating too" (b/c i imagine since he was a shut in more or less before this most ppl prolly wouldn't know a brother exists unless the dead one was always shit talking him lol)