Find Your Starting Point
Answer a couple of questions and I'll point you to the part of this site that fits where you actually are.
No email needed. Takes about 30 seconds.
Fair warning up front: this won't hand you a script for getting someone back. What it will do is help you find your footing and work out what you actually want — which, whatever happens next, is the part that's yours.
What are you trying to work out right now?
Has your ex asked you not to contact them, or blocked you?
A clear "leave me alone," a block, or a flat no all count. If you're genuinely not sure, choose No.