Getting back with your ex

Recently my ex reached out and said that he can't get over me and I'm the o my one who ever made him happy (he dumped me). So now we are at this weird intersection where I moved on from him-but not completely. I asked why he left in the first place and he said it was to make his mother happy and my family happy, because I was better off without him. But now I want to know how we move forward with our relationship. Have you've ever gotten back with your ex, How did it workout?