Guys, Why would you text your ex happy birthday?

my ex texted me today saying “Hey, just wanted to say happy birthday😄 hope you have a great day!🎁🎉🎊🎉🎁“ I said thank you and of course it went back to no contact. (I was hoping a conversation would come out of it)

I haven’t spoken to him in three months and I was shocked to see that he’d even make an attempt since he cut ties because he wanted to lose feelings. Why would you text your ex happy birthday?
Guys, Why would you text your ex happy birthday?
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