Well done.
Break contact for two weeks - not because you want her gone, but because you need breathing-space.
Within a week you'll know it was for the best. It may be harder for her, if she didn't see it coming - but her life will also be better not stuck in a relationship where your and her depressed attitudes would only make it a misery.
Well done, again, being the dumper is often just as hard as being the dumpee.