I have to say you are so right. Looking at the relationship long term allows you to go through a much deeper transformation because you are not thinking about your personal here and now, but about the relationship's long term good. It's a completely different perspective...
I am constantly learning from my partner. I always thought my way was the best, but it's not, as I've found out. There are other ways, not better, not worse, but different. And that's ok. Once I allowed myself to see things differently, I didn't feel the need to defend myself all the time. As paradoxical as it sounds, it was easier to see things differently....if you know what i mean.