Should I walk right past a guy who doesn't keep the friendship going, or smile and say hello and walk past?

If we run into each other, he'll probably pretend to be all interested to know what's new, even though he clearly isn't interested, as he would probably have caved in and texted over these past several months (just like I always used to with him).

So I don't have energy to answer his fake interested questions. What should I do to put him in his place?

Should I walk right past a guy who doesn't keep the friendship going, or smile and say hello and walk past?
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