OP thanks I am actually totally sick of the waiting too. My DP is moving out in a last ditch attempt to rectify things. If in six months his divorce is not done or well under way then he will not be moving back and I will move on. We have a child together too.
I don't think many women would move in with a man if they thought he would never divorce, but waiting until the divorce is completed, like the OP, felt like I was putting my life on hold. And basically, you trust too.
I now realise that my DP, after one marriage, was then going to use delaying his divorce as cold feet for commitment. Although how you can back off commitment when you are living together and have a child is anyone's guess. I dragged my DP to counseling and just kept on telling him how vulnerable and stressed it made me, and in the end just an ultimatum. He still doesn't actually see how bad it makes me feel.
And OP, I also do totally understand your feelings. Even if they do divorce, those feelings of being dragged through the mud to get there are pretty damaging.
I'm the opposite though with the house, it is DPs house, and I gave up work to look after our child. It is hardly any equity now, but we need to make it crystal clear how finances and property are shared/or not if we ever manage to make it through the next few months. I'd visit a solicitor myself OP, I'm going to do it. And if your DP does get his arise into gear then you'll need to get this out in the open.
What do you want OP? Are you so cross you just want him gone? As it is your house maybe you should kick him out. Not divorcing is a pretty big deal. Then you have time to think for a while. If he responds to that massive kick and divorces etc, maybe you'll take him back, maybe you won't. But never be called 'a nag'. If it's like that he will ONLY respond to actions i.e. Kick him out.
I'm not one usually for the dramatic but in the spirit of solidarity this procrastinating of our DPs is never going to change without us firmly drawing a line. Now!!!