I used to think that there's a secret to all relationships... i.e. trust, love, etc.

But lately, I've been thinking that maybe there isn't a secret to all relationships. Maybe every relationship has one or two things that make that one specific relationship work. Sometimes it can be hard to appreciate that one thing from outside the relationship, but that doesn't mean it's not there and making two people very happy.

Given all that... what do you think the secret is to your relationship with your SO? What makes it work as well as it does?