Breakup :/

So me and my boyfriend were together for 6 months (oct-April 2016 to 2017) we fell off and he hit me up last November saying he changed and I took him back I don’t give second chances and he got one we’re long distance and he’s been seeing other people this whole time and I broke things off today but my heart hurts I’m so sad I don’t understand how someone can do that to someone he told me loved and cared about me all the time and it’s just lie.