Let me ask you this then....what would it take for you to be "sure"? What could possibly happen within the next couple of weeks that could make you convinced staying with her is the right thing to do? I ask that because it's highly unlikely (less than 25% chance) that any permanent changes could be made in that time, including the time you've already gone through in the previous weeks. Permanent change requires MONTHS or YEARS of reinforced behaviors, not weeks.
Honestly, just curious...not being antagonistic here.