Why would a guy avoid a girl but not block her?

Like if he sees her in person, he'll go out of his way to physically avoid her or even her seeing him. But he won't block her on any social media and even made a new account after SHE blocked him.

He says they never dated but his behavior is strange.

Why would he physically avoid her but not block her?

Why would a guy avoid a girl but not block her?
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