Not wanting to be on this boat........

[Buffet]

I do not feel like I have been doing a great DB job, but definately appreciate the support! I am struggling with trying to not say anything dramatic...W is such a roller coaster back and forth from nice and open to crazy angry nasty things coming out of her mouth. It is hard to keep believing that this is someone that I would want to spend the rest of MY life with.
Yesterday We took S2 to go over to my Mom's for trick or treating and my brother and his fiancee were there. (Makes it more tough right now as they are planning their wedding in 3 weeks!) And brother was telling everyone that his best friend had left his wife back in September and how he was disgusted by that. My W quickly jumps in how horrible that is and she always thought they were the "perfect" couple blah blah blah...
My mom and I just looked at her like &@!$^!@^!!!! My brother knows that we are having issues just not how serious they are.
How can she sit and talk about how important marriage is and how she is shocked blah blah blah, and than be doing this crap? This kind of thing makes me angry beyond belief.
I have heard others on here with similar feelings I go from sad, to determined to make it work, to angry with her, to depressed, and than back again. I really need to work on me and get past this ability that she has to alter my thoughts so much...