Why did he do this?

So me and my ex were together 5 years and broke up 7 months ago. We were talking for 6 of those months till I found out he had been seeing someone else and lying to me. So I stopped contacting him. Last week he texted me and asked what day I was graduating. I didn't respond and a week later he is officially dating this new girl. Why did he even text me?
Why did he do this?
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