How to get back to my happy self

I was seeing this guy on and off for a year he has lead me on and today I finally got free of him I fell in love with him but he is a manipulative selfish person and today we got into a fight because he kept talking about other girls and he said I wasn't a strong woman and that I was weak and he can make me feel very insecure in a matter of seconds I guess what I'm asking now is after I have got free of him how do i forget about him and become more confident again I have got major trust issues and don't want to meet someone new for a while but I want him to see that I have moved on even if in my heart I haven't