Why do they do this?

We went no contact. I saw him on holiday and we literally ignored each other completely. He was with girls the whole time. He tried to message me by replying to stories every so often and I ignored him for months just to finally give in and start replying back to his messages again and he completely left me on delivered. It’s now been 24 hours. Would I look crazy/ like I’m over reacting if I unfollow him? I’m just so over these games.
Why do they do this?
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