Read: "My Instincts Are Telling Me It Stinks (Part 2)"
Living in the "now" is living in the moment, without taking risks. Whereas, living in the "right now," is all about taking risks, despite having an instinctive feeling that things could end in doom. I hope that you're all following what I'm saying here. I'm basically saying that it's important to live in the present, not fret about the future so much, but enjoy each present moment, appreciating your life as it is now. Of course, I believe in being motivated and driven, as well as going towards your goals and dreams. But, while you're going towards your dreams it's important to live in the present and appreciate your life how it is now. You should be optimistic about your current situation, because whether you're optimistic about it or not, it is what it is, and you're living in this very moment, so make the best out of it.
When it comes to living in the "right now," you have a decision to make, and it usually ends up being a rash, impulsive, and clouded decision, when it's too spontaneous, and too risky. When your instinctive feeling tells you that someone isn't going to be a good match for you, because of the knowledge that you have about the person, then you shouldn't pursue them any longer. I always talk about the importance of not wasting other people's time or your own during dating, so this is just another example. Many times people will develop feelings for someone that they know that they won't be able to end up with down the line. They should never have let themselves develop feelings for someone that they already knew instinctively wasn't going to be the best possible match for them. The only thing that I can say to people who already have developed feelings for someone that's not good for them, is that you've made a mistake, and you should learn from the situation, and not to do it again to someone else, or to yourself.
You should end that situation now, knowing that you won't be ending up together, and in order not to waste anymore time. As well, you shouldn't prolong the break up. You should rip the Band-Aid off and end things now, before you or they get even more attached. If this sounds like your current situation, then you've likely been dating this person for quite some time, and developed very strong feelings for them. To those people, it's important to break up in a kind, gentle manner, but be direct (see: "We Need to Talk"). You've spent a long time with this person, and despite the fact that you instinctively knew that they weren't good for you, you dated them anyway, and you've wasted their time, and your own. The least you could do now is break up in the best possible manner, and sooner, rather than later.