I think you should check this page http://www.mangago.zone/tag/Trauma/ Maybe u can recognize it if it’s there
I am sorry only could find one of these
http://www.mangago.zone/read-manga/ame_to_kiss/sa/sa-c001/
I read this just now and remembered this question. Similar idea at least if not the one. The uke wasn't abused by anyone but he has serious self-confidence issues.
http://www.mangago.zone/read-manga/kaeru_no_prince_sama/
I was looking for a manga: a guy who was abused by his parents and they constantly told him that he was useless, stupid and ugly. So years later, he has no confidence in himself, he is very discreet and shy
And one day, a guy tries to flirt with him and says that he finds him very beautiful
But he thinks he's just laughing.
So every time he tells him nice things the other is sad and he does not understand why