Regarding the phrase "cross to bear" and abuse, I must respectfully disagree. Abuse is never something that is to be tolerated or endured, as in a "cross to bear." It is evil! Enduring to the end does not mean passively accepting evil. It means to fight against evil, to do everything in our power to stop it. Abuse is evil and must be stopped because it destroys not only the victim but also the abuser. Abuse destroys trust, love, and our relationship with God. It has the potential to destroy a person's eternal life!
People who divorce their abusive spouse do so only after going to heroic lengths to save their marriage. And they agonize over it, especially if they have been married and sealed in the temple. Just because an abuse victim chooses to divorce his/her spouse, does not mean they don't take their covenants seriously. They most certainly do! And that is why they have agonized for so long over the thought of divorce. That is the reason they have tried everything they can think of to salvage their marriage.
And yes, people change! Abusers are masters of manipulation and deceit. Some say the signs are always there. However, abusers don't wear black hats to identify themselves. They are most likely charming, kind, supportive to everyone else but not to their victim. Quite often, the victim is the only one who sees the abusive side.
To the op: There are many good books which can help you. I recommend you read "Confronting Abuse: From An LDS Perspective". It can be found in most libraries and at Deseret Book. Also try reading "Smart Women Know When to Say No" by Kevin Leman. He's not LDS, but the book is very helpful and well written. Neither of these books encourage divorce nor do they insist on staying in an abusive marriage. They give you insight into why your abuser acts the way he does and things you can do to protect yourself. Seek GOOD counseling (not all counseling is created equal!) and read GOOD books on abuse (not all books are created equal either, LDS authors or not)
I say all this because I have lived in an abusive marriage for 19 years. My husband is verbally, emotionally, sometimes physically, and sometimes sexually abusive to me. I have tried counseling, talking to my bishop, reading every book on abuse I can find, confiding to family and friends, fasting, prayer, temple attendance, etc. I have taken the advice of many well meaning people and have had the abuse escalate because of it. My immediate family is dead and I am allowed very little contact with my extended family. I have no friends I can trust (they all think he is wonderful). I have nowhere to live except in my car with my children, so I have decided to stay until they get a little older. It is difficult on the best of days, and I keep praying that when I finally leave this marriage it won't be too late. Everything I have said here is knowledge I have gained from my own personal experiences with abuse. I am not a therapist. Just someone who is desperately trying to make the best of a hellish situation.