I have been married for 10 years. Prior to that, my husband and I dated for 2 years or so. I was engaged before my husband, and that one took me a while to get over.
What does it take to have a marriage last this long - hard work and total commitment from both people. We have fought and we still do, but we chose to be together and to weather those storms together, even when it annoys me that it is him next to me.
I don;t wake up totally in love and wanting him passionate every day - though those days still exist. That stuff is lust - not love. Marriage is work. Choices. dedication. 2 people wanting to make it work.
Finding the person that is in the same place as you are and ready for that is hard. Keeping that dedication and commitment through tough times is harder.
good luck. Hope that helps.

There’s no one thing to me. But I think what I’ve learned over the years is that if I’m not happy with myself or feel good about myself, then I’m bringing shit into the relationship. If I do that, then I’m poisoning it. So I guess I’d say if you want a successful relationship with another person, you have to be right with yourself first. If both people come to the relationship in that state, then the foundation is there to ride the ups and downs that happen over the course of a relationship.

I Have 2 friends who have been married for 20 years.
Basically it looks like love and patience

Mmm... I really think the following help...

Don't do things to arouse jealousy in your partner
Learn to control what you can (your innards)
And be detached from what you can't control
Learn to appreciate the creative ways people
Do things, this increases tolerance and patience
Cultivate being laid back
Don't use distress as an attachment tactic
Cultivate mindfulness aka Eckert tolle on YouTube
For breaking free of thinking, so you can observe your thought process rather than acting on ideas that might be negative
Learn good healthy coping skills for distress,
Be kind, loving and considerate
Learn the habits of chores and building structure into the week
Never betray your partner's trust
Never say mean or abusive things
Give no reason to cause distrust in your ability to look after the human heart
This is potentially the love of your life, don't allow yourself to ruin it with high expectations, control, abuse, cheating, selfishness, ... This is your partner, your team mate, you want to build up, support and have fun with...
Learn to laugh and relax
Once the inside of your head is pleasant company, then you just need to find another who is a good, caring kind person with integrity

Someone you feel safe and comfortable around.

Who makes you feel good

From my experience this makes a very pleasant living arrangement with my partner, we haven't had one fight yet,so good to meet someone pleasant

Only a year in so maybe someone has more to say about this

that makes alot sense I'm going try using that in my relationship . Right my girlfriend is mad at me she was talking about being done so I don't know right now but if things are okay Ima gonna use this because I want my relationship to be long sand successful