For me being in a committed relationship with another Christian was and is paramount
. To be able to pray together, worship together, love Jesus together, is just as intimate, if not more so, than sex (physical intimacy).
Being a Christian allows us to be mutually accountable to God in a way that calls us both to step outside ourselves, for we have a model in Jesus of "agape" love that is unconditional, sacrificial and boundless as modeled in Jesus Christ. Our personal pursuit of being more like Jesus only adds to the beauty and depth of the relationship. It's this third-party involvement of God that makes our relationship like a "trio" than just the two of us. I know he prays for me, and he knows I pray for him when we are apart. Knowledge of this, in itself, is encouraging and empowering to me. The point is, that it's not just about me.
On a selfish note, the best part -- I know he has to forgive me for whatever I do
(and I him), as that is the call of the Christian -- to forgive and to love without bounds. This accountability before God allows the relationship to grow within the bounds of a "sacredness" that adds depth and meaning to our love.
Having had this experience of shared values and love for God, I wouldn't have it any other way in a committed relationship. Ever.
13 years and counting.