Why she trying to flaunt new relationship on social media?

It is sad long distace relationship probably she will see him one time per year or never again...
She was my friend and she tried to date me. I rejected her. But I was polite and gentle. I said her reason and I respected her.
We knew each other almost for 6 years. 3 months after my rejection I tried to congratulate her on graduation but she was rude and angry. She almost exploded from anger.
For last 6 years this is her first image with boyfriend on social media and I am sure did it to show me.

One more info
During 6 years of our friendship I tried 5-6 to date her and she rejected me.
Why she trying to flaunt new relationship on social media?
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