to be in the same boat
to be in the same unpleasant situation
to show one's true colours
to reveal one's true nature, one's true feelings or one's true motives
have a chip on one's shoulder
to seem angry all the time because you think you have been treated unfairly or feel you are not as good as other people
to read someone like a book
to easily understand the true thoughts and feelings of someone by looking at how that person acts or behaves
to break the news to somebody
to make something known by everybody, (drop the bomb)
to put on a brave face
to try not to show how disappointed or upset you are about a situation
to keep someone's at arm's length
to avoid being very close to or friendly with s.o. or sth.
to put up a front
Crear una fachada, ponerse una coraza, hacerse el/la duro/a.
to do sth. behind someone's back
to do sth. without them knowing, in a way that is unfair
to hit it off
conectar con alguien
take someone at face value
to accept the impression that someone gives of themselves even though this may be completely false
to give someone the benefit of the doubt
to treat them as if they are telling the truth or as if they have behaved properly, even though you are not sure that this is the case