To the original poster.
Try as I may, i believe it would be difficult for many people to provide supportive positive feedback for the actions you have done.
Chances are, you may not even want to bother with this thread anymore based on the posts you've had already.
But here is what I think. I agree with the first poster to some extent.
Your actions were simply just selfish. All you obviously saw, were your own interests and your own fears. You did things that most people in society would consider despicable, furthermore you have done it often, and have lied to your boyfriend multiple times for doing it. On top of that, you kept lying to him and kept him around because you feared that you may never find somebody who will stick by your side like he did.
You don't deserve such a luxury, to even contemplate the idea that you deserve to be with somebody who will love and trust you, was simply blasphemy and hypocrasy. To have a good man, who is capable of dedicating hiimself to you, is rare enough for women out there, what makes you think you deserve that right?
"My question is, did I make a big mistake by breaking up an 8 year relationship and is it safe to say that I may find love again with this new person? "
Simply, you did not make a mistake, you don't deserve a relationship, you've broken the definition of a relationship. It was he that made a mistake by having wasted 8 years. I only feel sorry for this faceless man whose woes would be the death of any honorable man had he known what you had put him through.
Ouch, I realize I've probably said things you aren't interested in hearing. But I feel it is imperative that you realize what your problems are, which is you. You will only leave a trail of pain behind in your wake with the way you've been acting.
I hope you learn compassion and sympathy, or you will indeed lead a very lonesome and painful life.