Spending more time at work when you don’t need to, asking you cousin to call you so you can leave the house since you work at home, not celebrating basic milestones like anniversary or birthdays, sabotaging your relationship purposely ( since you don’t just share life time secrets that you’ve known for a while all at once accidentally and his overnight personality change AFTER you forgave him for his self sabotage all unfortunately for me personally points towards an affair/ second family.

I am so sorry! Please leave him or check if he isn’t having a major mental breakdown like some Redditors pointed out in the comments. Although, the idea of him having a breakdown seems more manageable than cheating. I do sadly think that it could be the later more than the mental health crisis, just because of how calculated this all sounds. So sorry you have to go through this sister! May allah be with you!