Interesting topic.
I'll talk from my "experience"
I've been married for 5 years.
With my wife from the start we had great connection. We had fun and we wanted to stay together the whole time. We dreamt to have a family and thank God we have 2 children.
When our first child born it got our whole attention. Little by little we lost our first love as a couple . But we didn't have a problem because the baby replaced our love. We couldn't imagine that something wrong will happen with us.
So..when our second baby born the real problems came up. I tried my best to work but that wasn't enough. My wife made complaints that she felt exhausted and lonely. I tried to convince her that this was temporary and the babies will grow up. We need more money so please have a parience bla bla. She tried he best but she couldn't calm herself. We had disagreements and huge arguments. But I didn't want to quit. I was seeing our children smile and I said to myself "Continue Novak"(that not my real name lmao). Sometimes I felt strong, some other times i felt weak and psychologically exhausted...
I asked myself why? Wasn't I trying my best? Wasn't I working hard? Wasn't I a good father? Wasn't I trying to stop the arguments and always first I said sorry? Where is my fault?
Believe it or not, this came to my mind. "Novak you don't love her the same as the first time you lived with her..." Propably you will laugh and you will tell that was obvious from the start you fool xD . Yes.. but for me wasn't that obvious because in my mind i strongly believed that I was giving my best!!! For 4 years i worked at nights and for some periods i worked double schedule. For what? For my duties as a father... Noo Novak...You don't have only duties as a father... You also have duties as a husband!!...
As a conclusion after this i changed my whole thinking and till now i am trying to be the same as the first time. We are better now. We still have our arguments but we are better now. I hope my simple "experience" will help. Pray for my family mates.