India, June 10 -- What truly makes someone a great partner? Is it emotional intelligence, physical chemistry, or how well they communicate? While all of these play a role, there's one trait that often outweighs the rest when it comes to long-term compatibility. According to relationship expert Jeff Guenther, this one quality can serve as a powerful predictor of whether someone will make a supportive, reliable partner. (Also read: Sleeping in separate beds as a couple? Relationship expert shares what it really means )

On his June 5 Instagram post, Jeff shared, "After 20 years as a couples therapist, I can tell you it's not how well they talk about their feelings, it's not shared interests, and it's definitely not whether they've been to t...