。
You don't need to worry too much.
Literal
Too-much worry-don't-[good-いい]-[sentence-final-よ].
A casual reassurance. ~なくていい ('don't need to') is the standard 'no obligation' form — literally 'it's fine even if you don't.' The final よ adds a gentle assertion, as if the speaker is confirming this to the listener. あまり + negative = 'not much,' and it works intuitively with modals like ~なくていい.