Why won't I let him???

I've always wanted a provider type... I'm used to always having to step up. I've been "the man." I'm afraid... I'm afraid to trust... I'm afraid to depend on him. In my heart, I feel like if I allow him to make my life easier, it attaches more strings to my heart that may one day be cut... The thought of the pain I would already feel is enormous. He said, "Let me help you. You have me now." Those words make me want to cry. I'm grateful, yet I'm still so afraid. He's been good to me. why won't I let him help me?