"They have been fighting a lot recently and have been on the brink of splitting many times. It is not yet clear if they are over for good, but they are done as a couple for now," contactmusic.com quoted a source as saying.
Vergara, who has a teenage son Manolo from a previous relationship, recently said Loeb wanted to start a family with her. But she was considering freezing her eggs as she didn't feel ready to have another child yet.
"We have a very happy relationship. Nick wants babies. Imagine me, again with a baby, when Manolo is 20. I guess eventually I'll do it - for love," she had said prior to their split.