How do you rebuild trust with the girl you love after hurting her so badly?

Regaining trust does not occur overnight. It takes time and support from the person you want to trust again. That person needs to show you an honest change. If you both love each other you can work through you mistrusting moments. This will only happen through lots of good honest talking and communicating you true feelings. It's good to show emotions. Be patient with yourself and the person you want to regain trust. Pray often.