Pelodis and Nemea are two 50 something's pushing 60 with no emotional regulation. So they just dump their relationship problems onto Thales and Andromede.
Like Nemea will be training Thales and just be like:
Nemea: Go in the cave. Fight the Manticore or whatever I said we were doing.
Thales: Like alone? You don't seem very interested in this.
Nemea: Yes, well Pelodis doesn't seem very interested in our relationship since he forgot our anniversary. Again. So get in the cave.
And then Pelodis will be working on Andromede's prosthetics.
Andromede: I have to ask, sex wise can these go inside someone?
Pelodis: Oh I wouldn't know. Me and my wife haven't had sex in two years! In fact she won't even let me touch her!