They were co-stars on "Chicago P D", reported Ace Showbiz.
"Sophia and Jesse just didn't work out. They dated for about a year and then grew apart. They're still friends though!," a source said.
No other details are provided about what probably caused the break-up.
Earlier this month, Bush was spotted without Jesse at various events.
On June 3, the "One Tree Hill" alum was seen working on her fitness on National Running Day along with her coach. On June 4, she was seen when leaving Chateau Marmont in West Hollywood, holding a male friend's arm.
Bush was previously married to her "One Tree Hill" co-star Chad Michael Murray until their split in 2006.