Help. Please convince me not to message his friend to get him to greet my ex a happy birthday

My ex broke up with me 6 mos back. after that he was leading me on, and been on physical relationship. I thought it would lead him back to me so I get on with it. Then I started then demanding for clarity then he told me he didnt love me anymore. And proceed on insulting me. then blocked me on everything.

Now the only possible contact I coild have is his friend. He has his birthday today. And I went out to get my mind out of if. but when im back, every memory camd rushing in. Now I wanted to ask his friend to greet him and maybe reconsider. I've been stalking his socials thru another account and he seem happy and not a single day passed without me crying about this. please. im a pit right now.