Search Results: get over a break up pain

I'm 33, live in Atlanta, GA, have a great job, nice condo, fun group of friends, a work-hard play hard lifestyle, and my faith is the most important thing in my life. I'm fun-loving, easy going, and always up for an adventure. I met a girl here that's a transplant from the midwest like me, and we've dated on and off (mostly on) for the last 3 years. She's my dream girl - beautiful, intelligent, grounded, Christian, adventurous, and we love and respect each other and have a lot of fun. There is really just one issue, however, that has torn us apart and has caused us to breakup now for the 3rd, and potentially final time.
That issue is the fighting. On our 2nd date 3yrs ago, I literally told her she has a very sharp edge when I noticed she went off on something in a surprising way. That has continued for these 3yrs, and has been a huge source of pain and countless long (all night) fights. The pattern I've seen over the years is that she takes many things too personally, then creates an argument in an attacking/ harsh/ intense way. If I stick up for myself, it ends up being a horrible, exhausting, fight and it got to the point of effecting my work, health, and overall life.
She thinks, however, that she's just stating her opinion on things and I'm overreacting. I think we should have an open relationship where we can share opinions, but the way she does it (timing, sharpness, accusations, etc.) is unhealthy and over the top.
Also, last summer when we broke up and I thought we were done, I hooked up with other girls - it has been hard to deal with and I don't know if she'll ever let it go. I have been as understanding as possible and apologized for all the pain it caused.
So- after 7mos of being back together, more fighting caused me to end it again 3weeks ago. I love her, miss her, and wonder should I move on or try to save us? I want nothing more in life than to have us work, but I'm scared of going down a road that will only lead to more pain and failure.