You said eren never *ever* cared about mikasa and showed times where he's very obviously cared for her and now you go back and say it wasn't loving enough??? I mean they litterly spend time in the afterlife together I don't know how much more loving that can get...

And here's a picture of him checking up on mikasa after she was injured

Also in the second season when they are about to die, eren promises to wrap her scarf around her forever and punches the smiling titan (unknowingly unlocking the founders power and saving them both)

In the very first season when eren is on trial for being a monster the people say they should dissect them both and eren visibly gets upset and starts yelling that she has nothing to do with him being a monster

Ahh yes, eren clearly has never cared about mikasa, it's not like he'd crush the world so she could live a long life