So, divorce is okay sometimes, but not others?
What in the hell are you talking about, or what are you after here?
Go haunt another thread.
Don't know about "okay" - but not all divorces are created equal. There are issues with risk of physical harm, constant emotional abuse, serial adultery on the part of husband or wife, etc - and then there's the whole topic of whether a marriage between two non-believers even falls into the same category, Biblically speaking.