When a relationship is not about owning the other and when it is about giving and you relish the joy of giving, then unconditional love is possible and perhaps also practical.
When you enjoy the very act of giving, you don’t need to expect anything in return.
When you have expectations from the other in return to your love, it is the beginning of the conflict. Then you start wanting to control the other and no one enjoys being controlled.
Unconditional love is about giving freedom to your loved ones from your own wants and needs. Of course you are still responsible for your own wants and needs, but you don’t have to hold others responsible for them, especially those whom you love.