You shall fear YHWH your God. You shall serve him and hold fast to him, and by his name you shall swear. He is your praise. He is your God, who has done for you these great and terrifying things that your eyes have seen.
Deuteronomy 10:20-21

To love God is to fear and obey him, to be loyal to him, and to rely only on him as our ultimate defense. God is both the object of our praises and the reason for any praise we might receive.

You shall therefore love YHWH your God and keep his charge, his statutes, his rules, and his commandments always.
Deuteronomy 11:1

To love God is to be attentive, to honor his rules & decisions, & to obey his commandments. If you don't do that, then you don't love God.