You’re his omega to be put simply. And while Blade leaves on his long missions with his fellow Stellaron Hunters you happened to become distressed, leading to a type of depression only a stressed out omega with separation anxiety could possibly have.

It made you nest for days on end till Blade returned.

“..Angel..” he who is normally so stoic sounds shaken, concerned as he steps towards your nest on your shared bed, the same bed he hasn’t slept in for about two weeks while he was in Penacony.