Don't make yourself upset while someone's living their lives with others

If you still grieve someone, the main reason is because you haven't met the person that will make you happier "yet".

"Yet"

You will find someone which is more true for you, you will find someone that will make you feel much better and gain your attachment again, you will find someone you will love more than you loved your ex. You will find the true one, one day.

You are upset now because of feeling alone. Not truly because of your ex.

When true time came, you will get over these completely.