First loves

So I recently just got out of a really toxic relationship with this guy. We planned to have a baby to together and it happened (I have a 5 year old from a previous relationship and she called him dad)  and about two months ago I miscarried. Two weeks after that he broke up with saying he had to find himself. Our relationship consisted of a lot of arguing over him never being home. He would come home 1 out 7 days and then stay at his aunts house. From the outside looking in he was the wrong guy for me. But I can not seem to shake him out of of my header hurt. We occasionally have sex with each other and just recently he told me he met someone and he likes her. How do I move past basically my first love?