Yes, get expert advice. Figure out what you need to do to protect yourself and carve out a good future for yourself. If she is playing games with you - don't take the bait. No matter what it is - small or large. I've seen a few posts where one partner files first thinking it will get a certain reaction or the other will change their mind, etc, etc. It never happens that way.
Let her bring the game to you and yes be prepared.
M:50 W:53 MR:20 D:21 S:17 S:11 BD-Sept 2015 Suspected PA Sept 2015-Confronted W & OM Dec 2015 Actually EA In house Sep:Jan/16-May 2016 W moved out:May 22 2016 OM-Intro Oct/17-On scene July/Aug 2017