How to ignore a guy and not feel bad about it?

I told my guy friend that I was interested in him and while he didn’t say how he felt about me, he seemed eager to hangout with me more. Anyway, I think he lost interest but was too much of a coward to tell me, because the communication diminished greatly (on his end) and whenever I’d talk to him about it, he’d say things like, “I really want to see you” but never initiated.) Fast forward to now, I haven’t spoken to him in about 2 1/2 months (mainly b/c he stopped texting me). He texted me asking if I wanted to get lunch/hangout with him, and I agreed, however, he never responded after that. I sent 2-3 texts asking if he still wanted to hangout, and nothing. But he continues to say “hi” to me in person? Tbh, I don’t like how he treated me and I want to ignore him whenever he speaks to me, but I feel bad doing so. What do I do?
How to ignore a guy and not feel bad about it?
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