the first thing you need to do is back off & let her be. Leave it for at least 4 weeks & then send her a short message telling her that you hope she's ok & to not hesitate to ping you if you can help. Be honest & authentic - it's ok - tell her you're hurting but you really do understand & she's important enough to you that you will wait. If she tells you it really is over after that, dude - move on.
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