Looking on the internet deeply has found these results:

Successful relationship is the most popular phrase on the web.

Sustaained relationship 1181,000 results on the web	Successful relationship 1579,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Ours was always a difficult relationship. But our relationship, it triggered something. No reason to rush this relationship. I never had that relationship with pops. Your relationship with this dog is unhealthy. What is relevant is her blossoming relationship with Bob. This relationship went from zero to 60 overnight. That relationship is usually classified as Uncle.	The probability of us having a successful relationship is no more than 20%. That truth is the cornerstone of any successful relationship. I believe that the creation of the right expectations... is crucial in any successful relationship. Maybe that's the key to a successful relationship. Can't even have a successful relationship now. I've never been in a successful relationship. Maybe that's the secret to a successful relationship. When was your last successful relationship?

Sustaained relationship

1181,000 results on the web

Successful relationship

1579,000 results on the web

More popular!

The probability of us having a successful relationship is no more than 20%.
That truth is the cornerstone of any successful relationship.
I believe that the creation of the right expectations... is crucial in any successful relationship.
Maybe that's the key to a successful relationship.
Can't even have a successful relationship now.
I've never been in a successful relationship.
Maybe that's the secret to a successful relationship.
When was your last successful relationship?