be swept off (one's) feet
To become very quickly or suddenly enamored with or greatly admiring of someone; to be so thoroughly impressed or charmed by someone as to fall greatly in love with them. I think the reason Jane gets so suddenly invested in new relationships is because she loves being swept off her feet. I was completely swept off my feet when I met my late wife, so now, I can't imagine life without her.
sweep (something) under the mat
To ignore, deny, or conceal from public view or knowledge something that is embarrassing, unappealing, or damaging to one's reputation. The senator has been accused of trying to sweep his former drug use under the mat. You need to stop sweeping your problems under the mat. Nothing will get resolved like that!