Too late for a second chance?

It's been about a month since our breakup. My boyfriend said he wanted some space to figure things out and that he just couldn't be in a relationship if he didn't feel 100%. I know I did a lot of things wrong, I've realized this, and want to let him know that though I'm honestly doing okay, I miss him and want a chance to be better. He loved me so much. Should I tell him how I feel in a love letterish type thing? Too corny? It's what we always used to do.

I'm not gonna ask to get back together, but for him to know I've changed for the better and that we had something so great, it'll be hard to top.

+1 y
Okay maybe not a love letter haha, what about a simple email?
Too late for a second chance?
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