The Chelsea number one has released a statement saying they agreed to separate back in September.
Courtois and Marta have one child together, but she has now returned to Spain and will raise her family in Madrid.
The Belgian keeper had been in a long-term relationship after meeting Marta when he was on loan at Atletico Madrid and has recently been linked with a move back to La Liga with Real Madrid emerging as a leading contender.
But Courtois appears to indicate in his statement that he will now remain in London and is happy to pledge his future with Chelsea following his split.
The statement read: ‘Mijn girlfriend Marta and I are no longer together. Since the beginning of September, we have decided to end our relationship, on amicable terms.
‘We both went our own way, even though she was already expecting our second child. She moved to Madrid, I stayed in London.
‘We still love each other and we get along very well, but we don’t have a romantic relationship anymore.
‘But we don’t run away for our responsibilities. We are first and foremost parents of a beautiful princess, Adriana, and our about to be born son, Nicolas.
‘We’ll strive to give our children the love and attention they deserve. Marta and I will be still present in each other’s lives, as good friends and the best parents for our two kids.
‘Their luck is our priority. In the meantime we’re looking forward to the birth of our second child.’