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(TMZ)Future and Ciara didn't stay apart for long ... and it's all because Ciara feels strongly about her son needing his father around 24/7, reports TMZ.

Sources close to Future tell TMZ ... he and Ciara are living together again - and trying to make things work between them - so Future can help take care of their 4-month-old son, Future Zahir.

Ciara must be willing to overlook the past ... since she was the one who claimed Future cheated on her while he was on tour - and then broke off their engagement last month.

According to TMZ, Ciara wasn't interested in a shared parenting situation ... saying she believes Future's a good father and that it's best for their son if his dad's there. 

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