Sucks you lost someone but it’s important to have known it as many people don’t know this feeling at all.
As a man it’s important to build ourselves better and move on from things like this. This helps us grow and become a better man for the person who is right for us. It might happen in a few months or a few years but you’ll find another.
The important thing is to be open to random encounters that could change it all. You could meet her at a grocery store somewhere.