My ex (let's call him E) and I had been together for a few years and were friends before that. We ended up calling it off because of some family differences but were still kinda close. 

He texted me a few days back saying his family is setting him up with a girl suitable so for him (some people have arranged marriages here) and  he will get engaged soon. I got really upset and I told him I wont be talking to him anymore. I know its not my place to say anything against it, and I wish him all the best, but I can't be around him while he's engaged to someone else. Its very uncomfortable knowing the other person knows our history too.  

Out mutual friends think i was too harsh and that I shouldn't have asked him to not talk to me, since we have overlapping friend circles.
I don't want anyone else to change their relation with him at all, but I don't want to be around him either.

 Was I wrong to do that?