How do you get over ur first love?

Its going on 3 weeks and that shit hurts like a BITCH. I try so hard to numb myself I spent the last week in a half crying & im tired of it. We were together a year in a half & I was devastated but I snapped out of it. Still can’t picture myself with anyone else 😩he has acted so careless & emotionless ever since and it hurts me. My heart randomly started hurting as I was thinking about it and everything just plays through my head. He’s acted like he’s over me and it’s like how can you get over someone that fast? I feel like I never met nothing to him. It’s hurts I love him so much. He was my first everything. I’m in college I know there’s other fish in the sea but I wanted that fish😭. It hurts really bad man I’m trying so hard but the thought that he never loved me and never cared about me HURTS. I feel betrayed (no one cheated we just had very bad communication problems) it’s nothing we couldn’t have worked out but it’s like he doesn’t want to which also hurts. A year in a half & I couldn’t get closure .. a year in a half he couldn’t even speak to me face to face .. it all plays through my head smh. I want to be over him already. I dont stay home. I’m usually at work or hang out with friends so I don’t think abt him but sometimes even when I’m having fun he’s all I can think about. It’s really hard. I feel like I loved him so much & he didn’t love me nearly enough