I might have read this statement somewhere and it's been mind-bottling "Don't let your heart drive you, that you drive your heart". I am going through a separation and I have hope and faith that we reconcile our marriage. He is getting counseling and I'm praying. Please help me sort this statement out.

I don't know who coined the saying you mentioned but it reminded me of a thought that is described on the bottom of Campus Crusades for Christ tract, entitled "The 4 Spiritual Laws". Basically if your life was a train, you wouldn't want your feelings to be the engine. They belong in the kaboose.
Our primary mission is to get a relationship with God & do what He says; what we feel has very little likelyhood of being an excuse to disobey God.
Let me give you a blessing : Eph 3:14-21

Yes, I was bless by the words Eph 3:14-21. In fact,I have read it three times. My feelings can makes me do things I shouldn't so Christ lives in our hearts through faith that I do what is right. It's not the feeling but the love I have inside of me. I should be obedient to doing everything in LOVE and not be move by my feelings. I may not feel good doing somethings but do it in Love because Christ loves us. Thank you.