Depression Ending a Relationship?

Hi all. I know I have been posting in other subreddits, but I am just going crazy. My bf24 recently ended things with me because he felt like he didn't know how to reciprocate love and that that he did't want to keep dragging me through this with him when he wasn't being a good partner to me. He said he was scared that he'd never be capable and was freaked out about his selfish tendencies when thinking about marriage and children. We had it all. He fell in love with me at first sight, took me a litle longer, but we got into an extremely healthy and loving relationship. This started during the end of his final year of college, where he had no responsibilities. It was great. He was the perfect man for me.

His passion is music, but his father owns a company in which he is supposed to take over. Upon graduating, he was faced with struggle. He thinks music is a pipe dream, but does not want to work at his dads company in the same small town forever. He feels trapped and doesnt know how to navigate that without disappointing his family. Note: His family has given him everything and he feels guilty and like he owes them (he has never really struggled). We almost had him get a job elsewhere but he is so insecure with his abilities and skills and feels the guilt of needing to stay for his family and also doesn't want to risk financial security.

This is where it started to go down hill. We immediately went long distance when he moved home to start his job. This non-choice brought up a lot of his rather hidden depression and insecurity. I am his first ever relationship and everything of the sort. He was very used to being alone and aloof, "dealing" with things (aka pushing them down or avoiding them). Our relationship brought to the surface things he needed to work through and it freaked him out.

About 2 months into his new job his grandmother died, which is his first ever loss. That messed his brain up super bad. He feels so lost and down on himself and stuck. He would come visit me on the weekends but the hour and a half drive started to wear on him because he drives routes all day for work. He turned so angry as a person. Someone who was once so care-free, so fun-loving, so amazing turned so bitter and short tempered. He had one mental break and admitted he needed help to his parents but they brushed it off and he went back into denial. Now, the issues resurfaced and he knew he was turning into a different person and that wasn't fair to me. I assured him over and over that I would stick with him through everyhting but he said he needed to do this on his own to possibly be able to be a better partner for me. Do you think he will come back? I feel in my heart and soul he is my person and our story isn't over.