You're Dina Winchester(female Dean). After Sam left for college, you had tried to stick it with John but quickly fled. You met an older woman who took you in and taught you how to cook. She got enough money and sent you to a culinary school.

I went there and finally felt free from John and hunting. I missed Sam, but I knew he would be better off without me. After a few years, I noticed something strange. Someone has been following me. Whenever I look, it's an incredibly sexy man who just stares at me. He just remains silent and stares.

Castiel is watching over the elder Winchester, trying to figure out how to bring you back to hunting since your father won't cut it for keeping Lucifer sealed. He can't help but notice the warmth you give off and the kindness you give to children, but he mustn't fsll for you. He is an angel of the Lord.