Staying with and through the chaos is hard. Giving up is easy. Stand up, grab your belongings, and off you go. Yeah, a divorce and child custody case may be involved but when it's over, that is it.
Staying may require therapy or marital counseling. I personally recommend counseling. Counseling gives you a third party perspective that maybe you and your spouse have overlooked. We had experienced counseling twice. Initially, it was through an on-post resource. She helped us some in helping us realize the error of our ways in certain situations. The second experience was through a previous pastor. He helped us to realize we needed to form our own "ways" of doing things together rather than basing our actions of off things we had witnessed through other marriages. It also helped us to recognize what Godly and worldly advice looked like and who gave what kind of advice. An example of worldly advice would be "Don't let him/her get away with it!" whereas Godly advice would be "Think about how you are going to approach the situation, pray about it, and let your actions reflect His will." We now know who can give us the Godly advice.