A person may explain that “you need to live in the present.” This means that you need to get over something that happened in the past. Usually when this expression is told to someone it is because they are still being reminded of something that happened in the past. It could also mean that someone is always thinking about something that is going to or should happen in the future.
When people think continuously about an event that took place and is over or hasn’t even begun, they need to live in the present. They are spending too much time thinking about something that is not taking place right now. This also affects the way they are living right now.