Have you tried talking to your mate. The bible counsels us: There is a frustrating of plans where there is no confidential talk. Think about why you are depressed, when it happens and what you can do to combat it. Hope everything works out.
If your relationship is causing depression, then you are communicating with the wrong person and you have no common interests. I advise you to try online dating and for example if you are interested, then I advise you to read this match review. You will definitely be able to tell as much as possible about your interests in the questionnaire, or you yourself will be looking for pleasant communication.