I'm posting a reply without having scanned this thread - I want to come from my original intuition - for what it is worth.
The relationship in question is strained because of the perception from one partner that there is an inequality in the give/take of the relationship. The advice card would be just one part of the whole spread, I'd assume, but given just this one card, from a RWS perspective, I'd say that the advice is that giving is not a bad thing, and that perhaps it is the perception of the asker that s/he is owed something that is the problem.
Unconditional giving is just that - unconditional - no expectation of return. The beneficiary of giving is the person that's giving. The beneficiary of trust is the person that's giving the trust, not the person receiving it. Relationships are NOT 50/50 - sorry - that's just the cold hard fact of the situation. The joy of giving is in giving. If there's a feeling of resentment then the aspect that needs examining is the person that is feeling the resentment, not the person that's being resented.
Sacrifice, ownership, giving, and sharing - that's a relationship - also compromise, devotion, etc.
alec...