Core, I often tell LBSs, it is perfectly legit if and when you've had enough to move on, file for D, and go out and live an awesome life! I had a date set in my stich. If that date came and she was still not committed back to the MR, I was going to file for D. No one can blame a LBS for getting to that point.
My only caution is to ONLY do that when you are ready to be D'd. Do not do it (as LH says) to relieve pain. Do not do it as a final wake-up call for the WAS. Only do it when you are ready to move on in life without the WAS, and you are ready to end the MR.
I also only advocate it IF, IF the LBS has done all of the work on themselves. As the bald Texan TV therapist says: earn your way out. Otherwise you will have unresolved emotional baggage that you will carry with you UNTIL you deal with it.
My only exception to the above is in certain cases where the WAS/WS has moved out, and is in a R with an AP that they are open and unabashed about. I hate seeing LBSs sit idly by, stuck where they are at, when the WAS has moved on and is not even willing to consider R. I don't think this is your sitch. Typically, LBWs have more problems with this than LBHs do.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018
