You are the only one that can decide when you have had enough. If you are okay w/sitting in limbo a while longer and your finances/assets are in good shape, then I would sit back a bit and allow him to file.
You can move on and still leave the door ajar, if that is what you want. If you decide to prolong the situation, be prepared to pay lots of money to a lawyer and if he's like some of the others, will drag it out. Again, it's your call.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.