User blog comment:IamJakuhoRaikoben/Chapter 384: Attack of the Stars, Review./@comment-71.14.78.70-20140516230932/@comment-7418318-20140516232327

Several reasons.
 * 1) Loke didn't ask/demand her to break his key.
 * 2) We have no idea if Loke can still come and go under his own power if his key is broken, but I don't think he could.
 * 3) Unlike Aquarius, Loke is reliable. Lucy already came close to being killed due to Aquarius leaving her flapping in the breeze twice.
 * 4) Loke was always happy to come to Lucy's aid. Aquarius was always annoyed or outright pissed off when Lucy called her.
 * 5) Aquarius almost always hurts Lucy along with the enemy, when she can be bothered to act at all. Loke doesn't do that shit.