There are probably credible sources on the internet that will provide guidelines on how to deal with the symptoms when they are present in someone you love It's important you don't push them, but just be there for their support.
Make sure they're receiving proper professional help if needed.
It is the job of a trained therapist to help treat mental illness.
But if the person you are dating is depressed, it can mean some more hard work for you.Learn as much as you can about the affliction in general and your partner’s condition in particular.Knowing about depression will help you to understand what your partner is going through and how you can best help him/her. Get to know your partner Perhaps the biggest challenge in a relationship with a depressed person comes with the unpredictability and inscrutability of their moods.If you do find yourself taking on the role of a therapist, it may be time to reassess your relationship dynamic.Perhaps you can encourage your partner to see a qualified therapist for treatment.