It’s been 4 months sincerely I’ve been broken up with, how do I get my ex back?

My ex broke up with me four months ago. We’d been dating for almost a year. I really loved him, but the end of the relationship took a negative turn. I didn’t handle the breakup well at all and made a bunch of mistakes (begged, pleaded, stuff like that.) My ex got a new “gf” 3 weeks after we broke up. From what I hear they aren’t exactly serious. I don't know how to contact him because he blocked me on everything shortly after he broke up with me. I really miss him and have been thinking about this for a while. I feel like I’ve changed in a positive way. In the end, I’d be fine with or without him because life goes on, but I really truly do want him back. How do I get someone back who I can’t talk to?
It’s been 4 months sincerely I’ve been broken up with, how do I get my ex back?
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