I just unfriend my ex and took him off my relationship status and blocked him. I also comment under the relationship post that he comment on before I blocked him and said some hurtful stuff about him. My question is can he still see it even though he's blocked and comment on it cause I also see some of his friends from his page liked the status when we were dating. So I was wondering
No, it is not possible for someone you have blocked to see your posts on their friend's wall. Once you block someone, he or she is completely unable to see or follow your activity on Facebook until that time when you shall unblock the name.