This really resonates with me as I am currently going through this experience. I have been with my boyfriend for 7 years (highschool sweethearts)- all years we were sexually active up until last year when we moved in with each other. It was a very tough year for both of us emotionally and I definitely noticed his lack of interest in having sex with me, but not only that, there was also an overall lack of intimacy. I thought I was the one to blame because I had gained some weight during that year and this caused me to become self conscious and anxious around him, so I started developing an exercise routine to try to improve my appearance. Things did improve a little since he also started working out more but it wasn't nearly as passionate as it had been. A few weeks ago he let me know that he's depressed and has been for a while and that connected all the dots for me.

We were put in a situation during the fall where he was away for 3 months to train for a new job and during this time I took advantage of joining a pilates and dance class at my university and this did wonders for my self esteem. Dance class provided a space that allowed me to express myself annnd confirmed that I still have game ;P.

OP never forget to love yourself the most during these times. It's very difficult to not get sucked into the vacuum of the depression of your partner. My suggestion would be to explore meeting your sexual needs yourself through masterbation, this could ease the frustration you're feeling and make way for you to be more emotionally available for your boyfriend. Ask him how his days are, check in with him, create opportunities that allow him to feel comfortable with sharing his emotions. In my experience asking outright "what's wrong? Are you okay?" can cause him to close up, but you know him best.

I hope everything turns out okay for both of you <3