Why would you hurt someone's feelings?

My ex got married last week and apparently one of my class fellow (let's say her name is Z) was invited and since i knew it already so muted Z's Instagram stories.

On the day of marriage just to get my attention or make me watch her Instagram stories she liked 5/6 posts of mine on Instagram and when i checked notifications, saw her story and boom there I saw the picture. Yes it felt bad but she did me dirty 😭

Now why would you do that knowing that it might hurt the next person who's already fighting a battle and trying his best to move on without even saying anything to anyone. I even cut the ties with mutuals as i dont want to discus our matter with someone else. People are envious - Allah hidayat de unko.

Rant is over, thank you for listening