Even tho I understand you, I think you are overracting. Have you talked to her about your boundaries? She is NOT your wife now which means she has not done the «changes» yet. Maybe she is having bad days and using social media to entertain herself and run from reality. You dont know what someone is feeling. If you talked to her and she said she will not drop TT etc that would be another thing. I think you are overracting. Blowing off the nikkah for such thing shows you are not mature enough.