How do you get over a breakup?

I just ended things with my toxic ex after a year and half of drama, cheating and lies. It ended with an explosion you could say with everything coming out into the open and him giving me the silent treatment and running after the other girl (who he always leaves me for) who apparently went off at him and blocked him after spending the night arguing with him in his house since he kept going over to hers (she told me herself so idk). Anyway, he got mad at me when I messaged him again and then told me to go fk anyone I wanted and blocked me before I could block him. So yeah, big mess. Now I'm just lost and don't know where to go from here. He was my first everything but he was a narcissist and used me and destroyed me. How did you guys move on and heal after a break up? Any tips would be appreciated.