Can I want the relationship back?

Zoe
So I was kind of dating this guy for awhile, July of 2015 to the end of October of 2015, in short, he told me he loved me and I (us both only being 14 at the time) freaked out and started pushing him away, and ended up ending things. Now, we're on friendly terms, but I really miss the relationship we had because I realize that, yes in the moment I felt fine about ending it and whatever. But looking back, so many of the issues could've been solved by me talking to him about it. 
My question is, is it wrong for me to tell him that I wish I didn't end things? Or, because I ended it, I can't really say anything?

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