Marriage.

>Apart from that, how could I ensure that I end up living happily ever after with her?

Don't get married.

In just one paragraph you're asking multiple major questions that needed long answers.

Just take one step at a time. Secure your financial security first; that's a big task on its own.

>>18399366
>Meaning, what are the do's and don'ts of holy matrimony?

There's no magic guide. It's all between you and her. What works for one couple breaks another, what would fix one couple's marital problems could tear another apart.

This is especially impossible to answer when you're not even dating anyone.

>>18399377
I second this. Marriage is a fairy tail and a huge risk. It can end up fucking up your entire life if things don't work out. When it doesn't it makes you less satisfied with life and with your relationship than if you would've been if you weren't married. These are what are considered successful marriages. Don't fall for it.

https://www.psychologytoday.com/blog/living-single/201303/marriage-and-happiness-18-long-term-studies

Well, I would get a stable relationship first and then move in together, have sex, share chores, do financial shit together, go on a long road trip, hang with friends, do shit alone,do shit together. And then see how you feel about betting half your stuff you'll be together until death.