The Relationship Between Sex and Love

I dated a boy for three years in college. We both should have healed and moved on by now, but we haven't. I'm too afraid to replace that love with new love. How do you recover when someone simply stops loving you?How do you convince your brain that it was him, not you? i want to protect my heart, but damn do i want to love and be loved again. Ahb, youne killing me.