Srt, I am going through very much the same as you. One minute I think I am in control DBing and doing ok. The next minute she does or says something that just makes me angry at her. It just bounces back and forward so far though every time I have felt anger I have not shown it. I have just given it time to register in my mind I think it through and I have always been able to be polite and objective without showing anger or going the other way and looking needy or pursuing.
Basically I just tell myself that she is probably looking for a reaction and she is not herself at the moment and that gets me through. That's just how I am dealing with it but I am very new here. Maybe some of the vets have other ideas for you.
ME- 31 W-25 T-5 M-3 D2 ILYBNILWY and moved out - FEB16 W seeing someone else - JUL16