after the events of defenders, matt decides that the only person who wouldn't be endangered by his return is frank. they become a thing while matt is trying to pick up the pieces of himself and his beliefs and recovering in frank's safehouse.
then everyone else finds out he's still alive much too long after the fact to be okay with it.
frank/matt - matt lives + defenders et al. find out
after the events of defenders, matt decides that the only person who wouldn't be endangered by his return is frank. they become a thing while matt is trying to pick up the pieces of himself and his beliefs and recovering in frank's safehouse.
then everyone else finds out he's still alive much too long after the fact to be okay with it.