Another interpretation: "because it was near" (Exodus 13:17): the road for returning to Egypt was near, as it is said, "a journey of three days" (Exodus 5:3).
The Road Back to Egypt Was Dangerously Near
Yalkut Shimoni on Torah 226:5
דָּבָר אַחֵר, כִּי קָרוֹב הוּא, קָרוֹב הַדֶּרֶךְ לַחֲזוֹר לְמִצְרַיִם שֶׁנֶּאֱמַר (שמות ה, ג) "שְׁלֹשֶׁת יָמִים" וְגוֹ'.