Depression ruins my happy relationship

I’ve been with my man for almost 3 years now. I went through a period of depression and I had to fight for my love and happiness during that period due to my depression (obviously haha). I was happy in love no worries to bam doubting everything that I wasn’t doubting before the dark cloud. I got better though I had to fight hard but I got better even when he left for the military we have a very strong long distance relationship that I’m very proud of. I didn’t have to fight to know I still loved my man because after the cloud lifted all my worries and doubt went away and I was happy and in love once again. Flash forward and the cloud is coming back giving me so many doubts about my love for this man when just a few weeks back with no dark cloud I had no doubts. I hate this feeling of myself getting depressed again it was so hard and thinking of going down that dark path of not feeling my emotions scared the shit out of me. Last time I had him with me by my side to help me through it but now he’s far away from me. Idk what I’m asking I just needed to talk and maybe have some kind words to help me avoid another dark period. 💕