I'm at a comparable stage in my relationship as well. But a man being with a woman.

It's hard for me right now, because all I do is taking care for her, doing most of the household including cooking, shopping etc. while I am also going about my job. And then in the end of the day, I will constantly have to be the strong one. It is not my way of going about things with attacking people, but when she constantly nags, it takes a lot of effort to stay strong and not yell back at her but instead calm her down. And with all the weaknesses and issues she has, I have to be the supporter for her in that manner as well.
This has already taken its toll on me. I have days on which I feel like my heart is going to burst at some point.
No man, however strong he is in any way, can always and forever keep that energy up. And especially in the early stages of a relationship everybody tries to display himself in the most energetic, powerful way.
But even though that is a natural instinct and as soon as we've settled down, we let ourselves down a bit, most people tend not to understand, that everybody has his/her flaws and they get more and more clear, the longer one is with the other person. The weaknesses of the partner tend not to match our idealistic illusions of a perfect partner.
Maybe people should look for the imperfections in someone as soon as they meet them and evaluate if they want to be with that person based on wether one can live with these kinds of issues. Then we would only be happy with every new wonderful aspect of the other person that shows up over the time. That would be a much better way than the other way around, in which you first see only the good stuff and then find all the bad later on.