The funding from Yorkshire Forward, a regional development agency, will lead to the creation of 100 jobs.
The helpline is expected to go live in the next 12-18 months. It will begin with a pilot service from a call centre based in Doncaster, south Yorkshire. If that is successful, the service will be rolled out nationally.
The charity will begin recruiting immediately and will offer on-the-job training. "The centre will offer training and development opportunities to people such as mums who want to get back to work," a spokeswoman for the charity said. "They will be trained up and receive a counselling qualification at the end."
The spokeswoman emphasised that the service will not just be aimed at couples. "It's for anyone with relationship issues. So that could be someone who is worried that their marriage is breaking down, or it could also be a parent who is concerned about arguments within the family."