This is really bothersome. This is not even the "I have no clue about what is going on" dense. That one, while comedic, I can understand. It's comedy, it's silly. It's not supposed to make sense, it's over the top stupid. In those kind of manga the MC literally does not understand human emotions.
No, this is the: "I have such low self esteem, it's impossible that she likes someone like me". While being shown in every situation that yes, she does indeed like him.
This is just plain irritating.