Need advice for a good friend

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One of my good friends is involved or rather has been involved with her current lover for over 6 years and she has been married the whole time. Now this is the thing she and her husband don't associate anymore, but they still remain married as if it is okay. The other day she had told me that her current lover of the past six years has no idea that she never got a divorce from her husband and has proposed to her and she is just going along with it. I was like okay. So go and get a divorce it has been five years now since you two were "together". Her reply was You don't understand it isn't that simple, but we are going to get a divorce so that I can get married to my boyfriend. If anyone out there has been through this or understands please explain this to me. Why in the world do people not get a divorce when they decide to split up. My parents were married for eight years and then when they wanted a divorce they filed and a year later after being seperated they finalized the divorce. What is so hard about getting a divorce from someone? I know that you may be thinking that maybe he won't give her a divorce, but that isn't the case here. They just stay married to each other and won't get one for what reason? None at all. Is it that divorce is so expensive that many people can't afford it or what? I need some insight please tell me what is going on with this and why is this an issue for people. I need to know what to tell her because she said that her boyfriend doesn't know that she didn't get a divorce and she seems to have no real intentions of even attempting to get one. They have set the wedding date and everything. She said that she doesn't want to hurt her boyfriend by telling him so late in the relationship. What should I say to her to let her know that this is something that she absolutely has to do no matter what?