Guys, how to respond to the, "Hey. Been thinking of you," text from a fuckboy?

Anonymous
Okay, maybe he's not a fuckboy but he definitely got fuckboy traits. He pops up out of nowhere, sends me a text and shows interest then disappears for months (not exaggerating). Of course, I could always ignore his texts or respond politely but I'm tired of not defending myself. I feel disrespected and I want to call him out. The next time he pops up again, I want to prepare to fight back. I need to think of a very shaddy but classy way of saying, 'fuck you too'? All I could think of:
Fuckboy - "Hey, been thinking of you."
Me - "New phone. Who dis?"
Just joking but I want to throw back shade. Something like, "I also think of myself," but worse. I'm terrible at this. I need a good comeback because I can't stand this fuckery.

PS. Don't tell me to let this go and ignore it. I got the time and energy for this.
Guys, how to respond to the, "Hey. Been thinking of you," text from a fuckboy?
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