"You want Cassian to side with Nesta over Rhys??"
Yes, exactly. Hence the point of the mating bond being the most valuable bond in their world (even surpassing that of husband and wife).
Every time Cassian sides with Rhys over Nesta, he diminishes the importance of the mating bond being the most valuable bond in their world.
"Cassian has only known Nesta for two years!"
He only knew Feyre for two months when he sided with her against Rhys.
Lucien had only seen Elain for five minutes when he left Tamlin for her.
And let's be honest, Rhys would never side with Cassian against Feyre, who he's only known for two years.
If Cassian wants to be conflicted about who to side with then Nesta should still be conflicted about whether or not to accept the mating bond. If Cassian wanted Nesta to accept the mating bond, promise him forever, and be fully devoted and loyal to him and him alone then he owes her the same loyalty and devotion. He can't demand more from her than he's willing to give.
Cassian sided with Rhys against Nesta, and his mate went on to save all worlds. Cassian chose Rhys, and he chose wrong.
