If you feed your ego ahead of your soul, you won't know what you really want/need, and if you don't know what you want/need, how is anyone else supposed to satisfy you in any sustainable fashion?
The good news is that relationships can help you develop as a person. You should be growing together and on your own. If you care for someone and feel you're failing them in some way, it should drive you towards self-examination, which should spur new perspectives and development.
I would guess that you and your wife are less driven by ego than most. You probably don't reach a place where you're self-giving without at least corraling your ego. You may be at a point where you take it as a given.
To be clear, everything in your post is good. I just think it's Step 2, rather than Step 1.