I think it is important to talk to him about. Open communication is key to having a successful relationship. And at first he may be upset but he should eventually realize that it's not about him, it's about your mental state.

Can you try anything new that would interest you. When I say fake it, I usually fake it before we get to that point. So I'll try to interest myself on the drive over. And then sometimes by the time I get there it's not fake. Is there anything he can do that you really like, let him know. Is there something you've always wanted to do? Plan it out.

Are you on any medication for you depression -that can play a part in this and it's perfectly reasonable to tell the dr you would like to change because of that side effect. Are you in T so the depression can be solved?