I think this challenging message is worth pondering on Valentine's and every day. It is the message of what it is to love. It is also the message of what it is to trust. If we find it hard to trust, it will be difficult to give. The concept of giving and not counting the cost is valid for everyone, whether partnered or single and no matter what our circumstances are. It sounds very idealistic, but amazingly it actually works in a very practical sense. It is pure freedom, it completes us, it makes us whole. Our capacity to give also reflects our awareness of how much we have been given, another lesson we have to learn is that we can't out give God and that the heart of God is pure abundance.
Before I sound too pious, the lesson of giving (and trusting) is one that I am very bad at learning, or rather, having learnt it, God has to keep teaching it to me again and again and again!