Backsliding, also known as falling away, is a term used within Christianity to describe a process by which an individual who has converted to Christianity reverts to pre-conversion habits and/or lapses or falls into sin, when a person turns from God to pursue their own desire. In Christianity.
to lapse into bad habits or vices from a state of virtue, religious faith, etc
to have sex with someone you were previously dating or hooking up with. Specifically after a falling out or bad breakup and tends to make things more complicated.
Falling away 反叛 變節
Hook up 約會
Hang out 出去玩