Feelings

When you can turn your feelings for someone on and off depending on the situation or who else comes along, they probably aren't real. And if you're "moving on" with another person while you still have feelings for someone, how is that fair? Its not fair to the next person because a part of you will always hold back. Its not fair to yourself because you won't understand if you have better. It's important to completely understand how you really feel before taking a next step towards something, be it moving on with someone else or already being involved with someone. You have to really understand your own feelings and emotions to make sure you aren't leading someone on and playing with their emotions.
No one says you dont have the right to be unsure or that you won't be period, but when you're unsure and you bring someone else into the equation, you're now messing with someone else's emotions. Which is totally unnecessary considering you're the one who can prevent that from happening. Basically all you have to do is be real with yourself so you can be real with another.