What’s a big relationship?
Mutual trust: We know the other will help progress toward the common goal, and never undermine it.
Commitment: We each do all we can to further the common goal, no excuses.
Honesty: We tell the truth about what’s happening, and we are honest with ourselves about what we are doing, and why.
Communication: We give each other all necessary information when it is needed, including information about what’s going on with us.
Have I missed anything?
Next question: if your relationships are lacking, given what you want to achieve, how can they be made bigger?
There’s lots in my book about fostering and maintaining big relationships.