How can he do this..

I lost the love of my life. I see quotes that saw “you are the love of my life but I’m not yours” I understand it now. I feel in my heart he is meant for me. I love him so much. It’s literally killing me to let him go. I have never felt this kind of pain before. I don’t want anyone else. I miss his company and the intimacy. I know he doesn’t love me like I thought. If he did then he couldn’t do this to me. I know I shouldn’t bother with any of it but not even a month after leaving me; he started talking to someone else, has spent the night with her and bought a car. But hasn’t even bothered seeing his kids. Says he’s working too much. It’s breaking my heart. I need my family. And want my family whole. But there’s no going back after this kind of heartbreak….. he doesn’t even want me back so I know I don’t have a chance anymore. But I know and believe he will regret leaving. I have admitted to my wrongs and apologized but I didn’t get anything in return. We were both in the wrong with a lot of things. But it just hurts worse when he’s making it seem all my fault. It’s almost been a month and I’m still feeling so much sadness and hurt. A little bit of anger but nothing like what people say I should be feeling. It really hurts and I just want to know it gets better. I can’t go much longer feeling like this. I really can’t. I don’t know how. Please give me advice or encouragement

Thank you to the kind commenters. I spent a good part of my life with this person. He’s my high schooler sweet heart. And I have so much love for him. He’s a good person. Just not making the right choices or has the wrong priorities right now and it hurts. I would never wish this pain on my worst enemy. I thought I was making progress but I feel like I’m going backwards now.