Another insider added: 'She's devastated. Ciara's focus is now the baby.'
Ciara is the one who did the breaking up ... she claims he was cheating on her while on tour.
It's complicated ... because they have a 3-month-old son, Future Zahir. We're told she has the kid and fully intends to get custody.
As for Future's response to Ciara's allegations ... so far he's radio silent.