I definitely am the kind of person to shut myself away when I have my strides of depression. My boyfriend has been great at helping me with it though. Mind you he's been a huge help to my mental health and I rarely find myself depressed anymore.
Though when I do feel off or down I am very open and honest with him because I don't want him to worry about me. Because I have a TBI I have chronic pain, I get nauseous and puke and I also get dizzy from time to time. When my symptoms are bad I have difficulties talking or coming up with sentences. He's never had to deal with someone with a TBI before so it can get him worried, one thing we've realized is that communication has been key. It helps me understand what I'm going through and he is able to contextualize it, where as before I would just try to hide the fact that I was really not feeling well despite me throwing up or not being able to properly speak.
As time goes on I find it easier and easier to be open and honest with my boyfriend and let him know when I'm feeling down. However, my boyfriend is the only one that usually knows when I'm depressed or not feeling well. I've been getting good at hiding my depression because as a kid I would get punished for feeling emotions or acting sad. Nonetheless, now I don't have to worry about that I just tend to like to keep to myself when I'm not feeling the best.