I have depression, and my boyfriend doesn't and has never had MH problems, so it can be a struggle with not quite being able to relate to each other. There have been several times when I've nearly worn him out with my depressing texts and low moods, but he tries his best to always stay supportive. He's told me before that one of his best friends had depression in the past and he supported him a lot through it, so at least he does have experience of a loved one with MH issues.