If you are already worried, angry, and confused after just 6 weeks of dating, I suggest you just accept that he changed his mind about wanting a relationship. I am sorry that he built up your hopes about having an exclusive relationship only to break up two days later. IMO, his depression was an excuse (not saying he doesn't have depression but depression doesn't make you "break up" though it can make you not want to go out as much). The ball is in his court. If you chase him, it will not change his feelings for you. I think there is a good chance he changed his mind about wanting to date you anymore. Also, sometimes we don't know for sure how people feel about us and we have to just accept not knowing; however, if he continues to have no contact then THAT is the true way he feels. Sorry you are going through this.