There are people we meet are grow quite fond of after a while. Yet, sometimes after that while, the fondness we end up feeling toward them is not reciprocated or mirrored back, and yet we still feel that there, for some unclear reason we should continue to spend time reaching out to them.
It is a simple rule: Spend time and energy for those who prove to be willing to spend the same for you. Never spend a minute provide another favor of some sort for someone who has never shown the decency to spend a moment with you.
With that said, those who do prove to be trustworthy, reliable, and loyal deserve much of your time and effort to keep building a true and lasting relationship.
And when someone does show loyalty and trustworthiness, cherish that person well. Leaving them to the world is tantamount to throwing a diamond in the sea.