We all have justify our lives, don’t we? Well, not really to God.
Conditional love is this: X is good, and therefore and because of that goodness, I love it.
Unconditional love, specifically God’s, is the reverse: the entirety of X’s goodness is due to my willing this good to X, to infusing goodness into X, to my love for it.
I’m sure there is conditional love in God, too. He may delight and rejoice in your goodness. But the main kind of love works differently: whatever goodness you have, you have it because God willed it to you. This love is unconditional because the conditions themselves are part of what God gave you.
It follows that you can ask God for anything you want in prayer without worrying about being a sinner. God gave you your virtues. Your vices and flaws are not positive existences but privations, absences, lack of the good that ought to be there but is not. So the whole of you is from God. And God by His nature is a gift-giving creator. If He gave you your existence and life, your essence, your powers, what else wouldn’t He give you?
Of course, God doesn’t have to respond to prayer, it’s His decision, but He likes it.
There is a less formal and more substantial sense of love which is interpenetration of souls — union, mutual indwelling, etc.; thus, God enjoys more communion with a saint than with a sinner and hence loves the saint more. God is in the state of greater communion with X than with Y and so loves X more.