The more important question is "Can you trust them again whether they deserve the trust or not". Even if they change, if you can't get over the moment you are wasting your time and theirs.
I knew she felt guilty and wanted to change, but at the same time I knew I could never trust her again, so I made the decision to leave. Not her problem, mine.
How strangely will the Tools of a Tyrant pervert the plain Meaning of Words!