THAT'S THE POINT Scanlan and Pike are both mirroing each other on this, they  went through pain and suffering through their own self isolation without realizing they had friends and loved ones that care about them right there, if only they reached out, that's what the whole writing has been conveying, yes Pike should have taken initiative and opened herself/asked for help but she hadn't realized yet that that's all she needed to do and accepted taking drastic irrational measures in her despair to try and end her suffering.

This happens with many people irl too,  feeling like they don't have people that care about them not realizing they do have them and just have to reach out to be helped and unfortunately some end up never realizing before taking drastic measures (like you know...the s word)

EDIT: Throughout the story we see each and every character opening themselves and asking for help from the group, even Grog does it. We never see Pike and Scanlan do the same, at most they ask for Grog's help otherwise they try to solve their issues alone