I've been dating my boyfriend for nearly a year now and I don't think he's the guy for me. Nothing drastic has happened, it's not like he disrespect me or is abusive. I just don't feel the spark. I know I should've realized this sooner and I did but I couldn't tell him because he suffers from depression. Everytime I think about telling him, he sinks into a depressive phase. It's getting too much for me now. How do I tell him the truth without damaging him?