Would you be mad?

Would you be mad if your current boyfriend is still liking/loving posts on Facebook that has to do with his ex that he “hates” so much? Let’s add in the fact that he brings her up ALL the time (for example, if y’all went to six flags and had a ton of fun, he brought up the things that happened when him and her went to six flags when they were together) (P.S... that really happened)

Side note:

me and my sister are having a debate... I said I’d be mad especially with him constantly bringing her up. My sister said she wouldn’t care b/c he could just be venting. Please ladies if you press “it depends” as a vote, elaborate for me in the comments if you can what exactly it depends on.