Gwyneth Paltrow knows that in Hollywood, relationships don't always last.
"A long-term relationship between two people is an ever-evolving organism," she writes in her GOOP newsletter on Thursday. "Some stay the course, some fall, all stumble."
The actress -- who was engaged to Brad Pitt and dated Ben Affleck before marrying her husband of five years, rocker Chris Martin -- then says she "asked a few very wise women, most of whom are in varying forms of longtime partnerships, for their insights."
One expert Paltrow sought for tips? Monica Berg, a spiritual teacher and creative director at L.A.'s Kabbalah Center, of which the 36-year-old star is a follower.
"There are no stable marriages. There may be happy ones, but not stable ones," Berg explains. "Either we are growing forward or falling backwards. This is true in all areas of our life ... which is why I believe nurturing relationships is so important. We owe it to ourselves and those we love not to settle for mediocrity in any way, and instead to nurture and allow our relationships to become the source of joy, support and love that they were intended to be."
Tell Us: Would you take relationship advice from Gwyneth?