William Chan's popularity skyrocketed after starring in the Chinese Drama, Swords of Legends.
For the first time, William also made it to the 70th spot in the Forbes China Celebrity list and been ranks higher than his girlfriend Charlene Choi who is at the 95th spot.
When Charlene announced their relationship, the couple faced public scrutiny as Charlene was considered the more "superior" between the couple.
Just when their five years relationship was getting stable, rumours that the couple parted ways circulated, reports Asian Pop News.
A source siad that since William shot to fame,, his work is endless and the couple has less time together.
As such, they have grown apart more and feelings have gradually faded.
The couple reportedly have not officially announced their breakup.
William and Charlene's manager has dismissed the rumours and said, "We will not respond on fabricated rumours."