How do I get over body issues?

I have never really liked my boobs because of how different they are but thats not the main issue! my ex would constantly tell me (literally every time I would eat anything) that I was going to get really fat and constantly put me down about my body! The most I have ever weighed is 107 and as soon as I saw that on the scale I freaked out knowing he would hate me (that weight was while we were still together) so I basically quit eating in front of him and tried to lose weight! I lost down to like 102 but eventually we broke up and I gained it all back and I'm super self contious(spelling?) About my body so how do I get over constantly feeling bad for eating literally anything because I feel horrible about my body every time I eat! Please help!