Why is it so hard!?!?

The past few months have been so hard! I never would have thought I would be in the position I am in right now. How did I let this happen? I ask my self this almost everyday! I guess I was just too trusting for too long. I need to learn to trust again and I also need to learn to be better judge of character. This person hurt me tremendously and I thought I got over it...but I realized that I did not. The other day I was at a local gas station and a car that I thought was this persons car pulled into a parking space just as I was walking in to pay for my gas. I literally froze and felt myself crouch down as if to hide myself. REALLY!?!?!? How in the HELL does this person have any effect on me anymore?! I have been lied to by this person and thrown away by this person and I was actually frozen with fear at seeing them. UGH! So offer it. I respect myself too much to let this continue. I will not give any more power to this person.