Why do guys text you just to leave you on read or ignored you?

I broke up w/ him a 3 times. The third he left me on read for a month then came back w/ a weird message so I ignored him.
Today he texted me again and I responded politely just for him to ignored me. I’m trying to be mature without blocking him like before even though it hurts. If he’s not interested in me no more he can move on like with and delete my number.
Why do guys text you just to leave you on read or ignored you?
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