The Key to My Heart

I was at a Church event tonight and I was wearing one of my favorite necklaces. It is an old key on a chain.
 A gentleman in our Church came up to me and my mom and started talking to us. He looked at the key hanging from my neck and teasingly asked if it was the key to my heart. We continued talking and he said he wanted to give me a piece of advice. "Don't make a compromise when it comes to who you give that key too."

 Who has the key to your heart? Just who would you give it to? Would you hand it to a person just because you liked them or because you really believe that God really wants you to?