I'm Only Me When I'm With You

All I have been feeling these past few weeks is depression. I have had good times and had fun and I've been laughing and all, but the happiness only lasts for so long. After about 2 hours, all the reality of my life just comes back tothe from of my mind. It sucks so bad. I honestly do not know what to do about this any longer. It's carried on far too long and I feel horrible. All I can say is I'm really going to miss him.