Rejection shouldn't be taken this seriously. So you got rejected by your choice, it's happened to all of us.
Don't blame it on yourself, god, or whatever else. Because none of it is your fault. It's not your fault you like her, and it's not your fault because she doesn't like you back.
I know it's hard to think about it, but over time it will heal. When I first got rejected by my first I couldn't stop thinking about it for many months. I still remember it, but certainly the impact isn't as severe as she didn't "put me down" while rejecting my offer.
Perhaps you interpreted signals that were never there. It happens very often. Don't beat yourself up over something so miniscule.