What do you want from a relationship? I don't think it's unreasonable to want loyalty, support, acceptance, love, and space to grow. I actually don't see how a relationship can last or be healthy without these things as this, in my mind, would prevent an actual connection.
That being said, I don't think a partner should be expected to make you whole, someone is going to be left not being whole. I think it's important that we strive to become whole on our own, and see my partner as someone who is supportive of my journey toward that, my backup.
If we don't have expectations (wants) of our partners, what differentiates that interaction from what we have with a stranger we greet in passing on the street or in the supermarket? If we don't have expectations and have them met, how will we know that this is a soft place for us to call home and actually be able to commit to it? It's up to you to decide if you're willing to meet your partner's wants, and for them to decide if they're willing to meet yours. It's negotiation and give and take. If it costs you too much to meet your partner's expectations, then I think it's time to reassess your participation in that relationship.
I don't think it's impossible to have a good relationship if you're emotionally unhealthy, it just takes more work and patience. It requires acknowledgement and a commitment to improvement (for your self), and understanding and support from your partner, and from you for their positive contribution. (I really struggle with self acceptance, but seeing my partner's acceptance of me kinda makes me thing maybe i do deserve that from myself. It's not that mine is dependent on her acceptance of me, rather that I'm considering her example.)
And I do think that if a couple can navigate this journey successfully it builds a much stronger relationship because of what went into it to make it through.
As for a winner and a loser? To me a relationship is about mutual benefit, and that doesn't align with having a winner and a loser.