If both of them grew feelings with each other in future chaps...their future will be very rocky like YEAH (not saying it won't work just very hard), imagine falling in love with your dead brother's wife and vice versa after shit happened.
Anyways, it isn't disrespectful nor a betrayal to your dead loved one since everyone needs love and be happy again. I guess this manga is saying that we all have to move forward. Past will always be a part of us but that doesn't mean we can't build our own future so fucking take a step forward and fucking embrace your present more and maybe a new spark of friendship/love may blossom when you least expect it during lonely times.
Thank you for listening to my not Ted Talk and yes I reread this whole.
