――――――――― HEADCANON #4.
Touch issues. Murphy doesn't like being touched and it stems from the traumatic experiences of his childhood. First, with being held back while his father was floated then when his mother was having a particularly 'bad' night after drinking too much. After her death, he was bullied and touched roughly until he started being snarly back and people stayed away from him. There is a fear now that correlates being touched with something devastating happening. It is nearly a mild form of haphephobia, which is a fear of touching and being touched.
Also, relating being touched with the pain and anxiety is a defence kind of mechanism to not think about and deal with the trauma he has faced, even more so now with what happened at the grounder camp for those three days. he just doesn't deal with any of it and a lot of what he faced on the ark is buried down deep and he just doesn't consciously remember it until someone gets too close and then he lashes out, feeling the panic he isn't fully aware of the root causes of.
This ties in with PSTD, which is posttraumatic stress disorder and something else murphy suffers with. It manifests in nightmares, anxiety and numbing to the events and such that caused the pstd in the first place. It developed after the grounder camp and has made him more volatile than he even was previously. It is another reason to keep people AWAY from touching him to ensure the flashbacks won't wash over him.










