maybe behind story? https://www.mangago.me/read-manga/behind_story/
Split personality: https://www.mangago.me/read-manga/absolutely_ruined_love/
Moritat is one of my all time favourite Psychological BLs, so I highly recommend it.
You can also try:
-Stalker's game
-Glen
-Silent colour
-Criminal interview
-Murderer Lewellyn's enchanting dinner invitation
-Black Mirror
-Who's your daddy?
-Escape into oblivion
-Kill the lights
-The pawn's revenge
I have just started Moritat and I am already at chapter 15! It is really good!! Thank you so much! (●'◡'●)ﾉ
Hey!
I absolutely love psychological BLs like „Lost in the cloud“ or „Double Trap“ with a split personality. I also really enjoy „Love in Orbit“. Does anyone know something similar to them?