Hearts Unbound

The heroine, an introvert goes through a lot of struggles in her life till she joins college.
After she joined college also she was alone until she met her hero.
He is an extrovert, fun-filled person who has a loving family and amazing friends to support him at each and every part of is life.
At their first meet, they start off on the wrong foot. But slowly both start falling for each other.
At the end of the college, something unimaginable happens and then they both part ways.
3 years later, they both meet during an unexpected situation.
What happened? Why they didn't meet during those 3 years? Were they in love during college? If so, what happened....... Let's see