Split with my wife of 9 years.

I had a bad argument with my wife and made the ultimate decision to split up..I kept feeling like boundaries were being pushed, she had broken my heart by talking intimately with another guy years ago and only found out a year ago, I just couldn't seem to shake the bad feelings away. My honesty with it still bothering me led her to say that she had apologized to me already and healed from it. But her recent actions with posting images in Instagram and talking to a past mutual friend that knew about the other guy and even encouraged her to pursue him, it just led me to wanting to put my foot down, very angrily.

I felt like such a coward. Even when I was arguing, I was waffling around the fact that i'd already said we should split up. And even now I fear that I might be making a big mistake. Even if the boundaries were seemingly small, I just don't want to be taken advantage of anymore. But it still really hurts leaving.