I can't with the comments, Like he forced her to marrying him and you blame the fl for doing that? Honestly I can't blame her, I'd do anything to get out of a force marriage by someone threatening to kill me even if that person is doing sweet talking it's still threatening.
Everyone keeps saying he forced her and from a realistic point of view yes, we would try to escape, but from her point of view the only reason why she didn't wanna marry him was because of blondie. She literally has feelings for him, so anything he has done she obviously does not blame him or care about it.
Just to let you know that this isn't a new Isekai
Here's the link
http://www.mangago.zone/read-manga/surviving_as_a_prince_s_fiance/
..and he's gonna fuck another one again