When a guy doesn't follow u back does it mean he's not interested?

He smiles and makes a lot of eye contact but he's shy , I followed him 2 days ago on IG but he hasn't followed me back , he's currently in a talking stage with another girl but he still makes eye contact with me , if he is intrested enough with me he would followed me back right? he's not interested enough?

When a guy doesn't follow u back does it mean he's not interested?
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