What does it essentially mean when 'he' offers you a lift?

I'm just really needing to know what all the possible translations/meanings are for this certain guy talk.

After work, I was waiting for my mum to pick me up and the guy I work with and who I really like, offered me a lift but I'm wondering, is that a definite sign of interest or is it possible he was just being polite (it was 8:30pm)?
What does it essentially mean when 'he' offers you a lift?
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