Those scars you have been carrying for years, those faded memories you might not even remember most of it, just know how much it hurt you and you refrain to open all over again.
When your heart acts dumb, it's better to hear your mind as it shall always act sensible and do whats right and won't fall for the melodrama and get soft cornered.
Some people are not meant to be in your life, then isn't it better not to keep them with you. No matter they knock the doors, even when it's tough, for you somewhere still know your heart had fell for the person and trusted for the time you were together. You want to hear the other side of the story and want to believe he wasn't wrong. May be the circumstances made him what you believed for years.
There are huge things at stake to loose now, and I can't really play with fire, it shall not only burn you but also your present relationship and one cant afford to take that risk ever.