You Are Worth So Much More
If you find yourself in this category, ask yourself, "Why am I putting up with this? Don't I deserve better?" Do all you can to immerse each other in counseling and problem solving, but if your situation does not improve, you don't have to tolerate it, just because you're married. If you feel guilty for ending it, you should feel more guilty that you let yourself be treated poorly.
Over-tolerance of bad behavior is largely ignored by our culture and instead, we are praised for enduring it. You are allowed to set healthy boundaries for yourself and whoever taught you otherwise is just plain wrong. If you find yourself nodding in acknowledgement that your marriage is really bad, get out now.