Jealousy

I have another question, if someone can answer?
As i stated in prior question , my exN has to go by my house when going to work. As things got bad and i saw him for what & who he really is i started making new friends and even went out a few times on a date. One night i had my date over and the N (who was in the process of discarding me)started texting me saying "i see u r busy" then the next day calling asking who was over etc.. I felt at this point no need to LIE to HIM so i told the TRUTH that i had a date . My question is this....if the Narc is discarding you Are they or do they get jealous if you move on? He was VERY aggitated.